JP4841218B2 - Small electrical equipment - Google Patents

Description

  The present invention relates to a small electric device such as an electric razor that uses a secondary battery as a drive source, and more particularly to a small electric device that displays the remaining capacity of a secondary battery in a liquid crystal.

Generally, in a small electric device, the remaining battery capacity is displayed continuously while the small electric device is in operation and in standby. That is, there are many small electrical devices that display the remaining battery capacity when the device is in an on state.
The electric razor disclosed in Japanese Patent Application Laid-Open No. 7-92245 is configured to display the remaining capacity continuously from the on state for a predetermined time immediately after the device shifts from the on state to the off state.

On the other hand, in the electric razor disclosed in Japanese Patent Laid-Open No. 2005-24566, the remaining capacity display is stopped at the first predetermined time immediately after the device shifts from the on state to the off state, and then the second razor The remaining capacity display is resumed at a predetermined time, and the remaining capacity display is terminated after the second predetermined time has elapsed, and improvements have been made. With this improvement, when the on state of the device shifts to the off state, the remaining capacity display is stopped at the first predetermined time, and the user confirms that the small electric device has stopped operating properly. In addition, after the notification, the remaining capacity is displayed at the second predetermined time, and the remaining capacity of the battery can be confirmed after the user ends as usual.
JP-A-7-92245 JP 2005-24566 A

  According to some of the small electric devices described above, the user can confirm the remaining battery capacity display even after the device operation is completed. In recent years, the design of portable personal electronic devices around us has improved significantly. This can be said to be a result of recognizing that the design of the product was emphasized as an important factor in the selection of the product by the manufacturer on the basis of the development of the product with emphasis on functions. Specifically, a part of a small electrical device is decorated with a high-quality metal such as titanium, or a colored light-emitting diode is irradiated on one side of the exterior of the small electrical device, or parts for design purposes only. It is set up.

  In such small electric devices that have shifted to emphasis on design, the remaining capacity display is continuously performed for a predetermined period after the operation is completed, or the remaining capacity display is stopped for a short period of time after the operation is completed, as in the previously described small electric apparatus. When the time remaining capacity display is configured, the normal remaining capacity display is continued even after the operation is completed, and there is a problem that the high design property of the small electric device is impaired. The user pays more attention to the small electric device immediately after use than the small electric device placed somewhere in the unused state. As described above, while attention is paid to the small electric device, it is desired that the small electric device is in a state of higher design than a state in which a normal remaining capacity display is performed.

  In particular, in the case of a small electric device equipped with a liquid crystal display, the remaining capacity display is indicated by numbers and indicators, and from the viewpoint of visibility, the arrangement position of the liquid crystal is often the central part of the small electric device, Compared to small electric devices that display the remaining capacity with a pilot lamp, the remaining capacity display has a greater influence on the design of small electric devices.

  The present invention has been made in order to solve the above-described problem, and when a small electrical device is in operation and is in a state where the remaining capacity is displayed, the operation is terminated and the remaining capacity is displayed. It is an object of the present invention to provide a small electric device that displays a remaining capacity without impairing the design of the small electric device as compared with the remaining capacity display.

(1) As described above, the small electric device according to the present invention includes a secondary battery serving as a drive source, a motor supplied with drive power using the secondary battery as a drive source, and on / off of supply of drive power to the motor. An operation means for switching, a remaining capacity detecting means for detecting the remaining capacity of the secondary battery, a liquid crystal panel for switching presence / absence of light transmission according to a voltage application state, and a backlight for emitting light from the back of the liquid crystal panel A reflective polarizing plate is disposed on the backlight side of the liquid crystal panel, and a transmissive polarizing plate is disposed on the opposite side, and the liquid crystal panel displays the remaining capacity of the detected remaining capacity at the negative portion. during power supply to the motor performs a remaining capacity display by emitting a backlight with a voltage applied to the liquid crystal panel in accordance with the remaining capacity detected by the remaining capacity detecting means, the power supply is stopped to the motor The It turns off the backlight after a lapse et first set time, furthermore, is intended to stop the voltage application to the liquid crystal panel after the lapse second set time.

Therefore, when the motor is driven, the remaining capacity is displayed in the display area of the liquid crystal panel and the backlight is emitted, so that the user can easily notice the remaining capacity display, while the motor In the case of a stop, the backlight that emits light first is turned off to restore the original design of small electric devices, while the voltage applied to the liquid crystal panel is maintained, and the remaining capacity display is seen. The voltage application to the liquid crystal panel is stopped when a further time elapses. Compared to the power consumption necessary for backlight emission, very little power is consumed by applying voltage to the liquid crystal, and the state where the backlight is turned off and voltage application to the liquid crystal panel is maintained is power-saving. The remaining capacity is displayed.
In particular, a reflective polarizing plate is disposed on the backlight side of the liquid crystal panel, and a transmissive polarizing plate is disposed on the opposite side, so that light incident from the transmissive polarizing plate is reflected in the positive portion of the liquid crystal. The mirror is configured with a high reflectivity that is totally reflected by the plate, the mirror does not have a high reflectivity in the negative part, and the display area of the liquid crystal panel is used as a mirror in a state where no voltage is applied to the liquid crystal panel. The LCD panel that functions and has a high level of decorativeness, and the liquid crystal panel with such a high level of decoration, immediately turns off the backlight after the motor stops driving, thereby restoring the high decorativeness of the liquid crystal panel and displaying the remaining capacity. It can be carried out. In addition, since the characters and graphics are displayed by the negative portion of the liquid crystal, the area having a high reflectance becomes almost all, and the decorativeness is exhibited even when the remaining capacity is displayed.

(2) As described above, the small electric device according to the present invention includes a secondary battery as a drive source, a motor to which drive power is supplied using the secondary battery as a drive source, and drive power for the motor, as necessary. Operating means for switching on / off of the battery, a remaining capacity detecting means for detecting the remaining capacity of the secondary battery, a liquid crystal panel for switching presence / absence of light transmission according to a voltage application state, and emitting light from the back surface A reflective polarizing plate on the backlight side of the liquid crystal panel, a transmissive polarizing plate on the opposite side, and the liquid crystal panel remaining in the negative capacity remaining in the detected remaining capacity. When the power is supplied to the motor, a voltage is applied to the liquid crystal panel according to the remaining capacity detected by the remaining capacity detecting means and a backlight is emitted to display the remaining capacity. Electric power The voltage application to the liquid crystal panel is temporarily stopped for the third set time after the supply is stopped, the voltage application to the liquid crystal panel is resumed after the third set time has elapsed, and the third setting is made after the power supply is stopped. The backlight is turned off after a first set time, which is a set time longer than the time, and the voltage application to the liquid crystal panel is stopped after the second set time has passed.

Therefore, in addition to (1), when the motor stops driving, first the voltage application to the liquid crystal panel is stopped for the third set time to notify the user of the motor stop in addition to the disappearance of the motor sound. After the third set time elapses, voltage application to the liquid crystal panel is resumed, the remaining capacity after use is displayed to the user, and the backlight is turned off after the first set time elapses to restore the design of the small electrical device. In addition, the remaining capacity display is continuously performed, and the voltage application to the liquid crystal panel is stopped after the second set time has elapsed. In particular, since the remaining capacity display is configured to display characters and figures by the negative portion of the liquid crystal, the area having a high reflectance becomes almost all, and the decorativeness is exhibited even when the remaining capacity is displayed.

(4) As described above, the small electric apparatus according to the present invention is provided with the liquid crystal panel so that the display area of the liquid crystal panel is located in the center above the grip as necessary.
Therefore, the display area of the liquid crystal panel is located above the grip, and even when the user holds the grip, the liquid crystal panel can be viewed without being covered with the user's hand. In addition, the liquid crystal panel and the protective panel of the liquid crystal panel are less likely to get dirty without being touched by the user's hand in other areas than the grip portion.

(5) As described above, in the small electric device according to the present invention, a protective window for protecting the display area of the liquid crystal panel is disposed at an acute angle downward with respect to the device center line in a side view, if necessary. The inner blade is driven by driving the motor.
Therefore, the lint that is shaved by the head portion and falls downward is less likely to adhere to and accumulate on the liquid crystal panel, and it is possible to prevent the visibility of the liquid crystal panel from being deteriorated due to contamination of the liquid crystal panel by lint. When the head part can be tilted in the front direction, the front end near the head part of the main body part is extended to form a ridge according to the movable region, and falling lint adheres to the liquid crystal panel. , It can further prevent the deposition. Even when the head portion is not configured to be tiltable, it is desirable to provide a heel from the viewpoint of preventing lint falling.
Here, the protective window is formed by molding a synthetic resin such as plastic, glass or the like into a predetermined shape in order to protect the liquid crystal. Sometimes called a windshield.

(6) Thus, the electric razor according to the present invention includes a secondary battery serving as a drive source, a motor that is supplied with drive power using the secondary battery as a drive source, and that drives the inner blade, and a drive power for the motor. Operating means for switching on / off of the battery, a remaining capacity detecting means for detecting the remaining capacity of the secondary battery , a liquid crystal panel for switching presence / absence of light transmission according to a voltage application state, and emitting light from the back surface With backlight,
A reflective polarizing plate is disposed on the backlight side of the liquid crystal panel, a transmissive polarizing plate is disposed on the opposite side, and the liquid crystal panel displays the remaining capacity of the detected remaining capacity in a negative portion, A protective window for protecting the display area of the liquid crystal panel is disposed at an acute angle downward with respect to the device center line in a side view.
These outlines of the invention do not enumerate the features essential to the present invention, and a sub-combination of these features can also be an invention.

The present invention can be implemented in many different forms. Therefore, it should not be interpreted only by the description of the following embodiment. Also, the same reference numerals are given to the same elements throughout the embodiment.
In the embodiment, an example of a microcomputer and a circuit will be described. However, as will be apparent to those skilled in the art, a part of the circuit is converted to software on the microcomputer, or the module on the microcomputer is converted to hardware on the circuit. it can. That is, the present invention can be implemented in hardware, software, or software and hardware embodiments.

  Hereinafter, the case where the small electric apparatus according to the present invention is specifically an electric shaver will be described. However, it is necessary to display the remaining capacity by having a secondary battery, and the driving portion operates by supply from the driving source. Of course, the present invention can be applied to small electric devices such as electric toothbrushes, nail brushes, facial instruments and the like.

    (First embodiment of the present invention)

FIG. 1 is a six-sided external view and a cross-sectional view taken along line AA of the electric razor according to the present embodiment, and FIG. 2 is a perspective exploded view of the electric razor according to the present embodiment. FIG. 3 is a perspective exploded view of a liquid crystal display related part of the electric razor according to the present embodiment.
As shown in FIGS. 1 and 2, the electric razor according to the present embodiment includes cylindrical inner blades 4a and 4c that can be driven around a horizontal axis, and a mesh-shaped outer blade that circumscribes the inner blades 4a and 4c. A razor head 2 that houses blades 4b and 4d and a motor 5 that drives inner blades 4a and 4c via a speed reduction transmission mechanism is disposed at the upper end of the main body case 1, and various operation switches 52 and 53 are connected to the main body case 1. The secondary battery 3 is provided in the main body case 1 so as to supply electric current to electric drive parts such as the motor 5.

  The main body case 1 is formed by screwing a front interior body 1c located on the front side and a rear interior body 1d located on the back side, and a plurality of fitting grooves and front exterior bodies 1b formed in the screwed front interior body 1c. The front exterior body 1b is fitted to the front interior body 1c with a plurality of fitting claws, and the front exterior body 1b is formed with a plurality of fitting grooves formed in the fitted front exterior body 1b and the plurality of fitting claws of the front cover 1a. The front cover 1a is fitted, and the rear exterior body 1e is fitted and fitted to the rear interior body 1d by a plurality of fitting grooves formed in the rear interior body 1d and the plurality of fitting claws of the rear exterior body 1e. The rear cover 1f is fitted to the rear exterior body 1e by a plurality of fitting grooves formed in the rear exterior body 1e and the plurality of engagement claws of the rear cover 1f, and the front interior body 1c and the rear interior body 1d are screwed into the interior. In the space formed in the circuit board 51 A configuration in which housed the secondary battery 3. The front cover 1a is formed by being bent so as to protrude from the portion where the liquid crystal display unit 10 is disposed toward the upper end, and the protruding upper end of the front cover 1a forms a flange 1g.

  The main body case 1 has a cylindrical shape with a widened upper side, and a liquid crystal display unit 10 and operation switches 52 and 53 are arranged on the front center line from above, and a circuit in which the microcomputer 50 and the like are mounted on the back of the operation switches 52 and 53. A substrate 51 is provided. The operation switches 52 and 53 include a power switch 52 for turning on / off the power and a select button 53 for changing a plurality of drive modes. The liquid crystal display unit 10 indicates the capacity of the secondary battery 3 step by step, and when the battery capacity becomes less than a predetermined value, the plug mark indicating that charging is necessary is indicated by blinking, and the type of drive mode is also indicated. Indicated by letters. On the back surface of the main body case 1, there is a wrinkle knob 8b that can be slid up and down by the user, and a wrinkle blade that rises a wrinkle starter 8a that is pivotally supported by the main body case in conjunction with the wrinkle knob and faces upward. Have. A jack 7 is provided at the lower end of the main body case 1 so that the plug of the charging adapter (AC adapter) 31 can be inserted and removed.

  The razor head 2 includes two sets of outer blades 4b, 4d and inner blades 4a, 4c arranged at the front and rear, a motor 5 serving as a driving electric power source for the inner blades 4a, 4c, and a configuration of the razor head 2. And a head frame on which elements are arranged. Inner blades 4a and 4c are supported on the upper portion of the head frame, and a motor 5 housed in the lower portion is disposed. Further, the head frame can be attached and detached with an outer blade holder 6 in which outer blades 4b and 4d are shaped and arranged. Here, the outer blade holder 6 may be provided with a center blade in parallel between the front outer blade 4b and the rear outer blade 4d. The center blade also has a fixed outer blade and a movable inner blade, and the fixed outer blade is fixedly disposed on the outer blade holder 6. The use application of the center blade is mainly for cutting long hairs and comb hairs, and in order to make it easier to catch the hair that the fixed outer blade takes than the outer blade, a large number of holes formed on the surface are formed long. Yes.

  The inner blades 4a and 4c are formed by forming a plurality of metal blades in a spiral shape along a cylindrical surface. A shaft is formed in the central portion of the inner blades 4a and 4c in the longitudinal direction, and inner blade gears are disposed at both ends. The driven pulley, which is arranged coaxially with the end gear with which the inner blade gear of the front inner blade and the inner blade gear of the rear inner blade are engaged, receives rotation from the driving pulley via the endless belt, and the inner blade gear rotates. The inner blade rotates by moving. By doing so, a so-called rotary electric shaver is configured. Here, the driving pulley is not directly rotated from the output shaft of the motor 60 but is rotated via a speed reduction transmission mechanism including a plurality of gears.

  Further, the rotation of the output shaft of the motor 5 is changed to a reciprocating motion via a gear, and the repelling motion drives the wrinkle blade (if there is a center blade, the center blade is also driven). In this embodiment, the rotary electric razor will be described. In particular, the present invention has a feature regarding the control of the liquid crystal panel 11 and the light emitting diodes 55a, 55b, and 55c which are backlights. The present invention can also be applied to various types of electric razors.

  A control unit (configured by a microcomputer and a circuit) mounted on the circuit board 51 receives inputs from various input switches and controls voltage application to the motor 5 and the liquid crystal display unit 10. The circuit board 51 is positioned in front of the secondary battery 3 and receives current supply from the secondary battery 3 as a control current supply source. The control unit changes the control of the motor 5 by pressing the select button 53 of the user, and realizes three modes of a normal mode, a turbo mode, and a soft mode. The normal mode is a mode that operates while maintaining a normal rotational speed. The turbo mode is a mode that operates while maintaining a higher rotational speed than that of the normal mode. The soft mode is a mode that operates while maintaining a rotational speed lower than the rotational speed of the normal mode. The control unit records which mode it is currently in, and at the next startup, it starts from the mode at the previous end. Each time the select button 53 is pressed, the mode is changed repeatedly in the normal mode, the turbo mode, and the soft mode.

  The charging adapter 31 transforms, rectifies, and smoothes 100 [V] commercial AC voltage input from the power plug into a predetermined DC voltage higher than the standard terminal voltage of the charging battery by a constant voltage circuit including a transformer, a rectifier circuit, and a capacitor. is doing. For example, when the standard terminal voltage of the rechargeable battery is 2.4 [V], the DC voltage supplied by the charge adapter 31 can be 3.0 [V].

  FIG. 4 is a block diagram of the electric razor according to the present embodiment. As shown in FIG. 4, the control unit has a switch 54 for switching whether or not to supply a voltage to the motor 5 based on a control signal from the microcomputer 50, and a DC voltage supplied from the secondary battery 3. The battery voltage detection circuit 20 detects the current and the charging control circuit 30 controls the current supply from the charging adapter 31 according to the charging state of the secondary battery 3.

  A microcomputer (microcomputer) 50 mainly includes a CPU (Central Processing Unit) that calculates and processes data from an input device (circuit) and a storage device, and a device memory (ROM, RAM) that stores data and programs. And an I / O port for inputting / outputting data. In addition, there are an A / D converter that converts a digital signal into a digital signal so that an analog signal can be calculated on the microcomputer 50, and a D / A converter that converts a digital signal into an analog signal, as opposed to an A / D converter. By providing this A / D converter, a voltage value such as a reference voltage input to an analog signal input port can be converted into a digital value. Note that the A / D converter and the D / A converter may not be components of the microcomputer 50, and can be configured to be mounted on a circuit board as an A / D conversion circuit and a D / A conversion circuit.

  For example, the battery voltage detection circuit 20 is arranged with a resistor connected to a line connected between the secondary battery 3 and the switch 54, and a voltage drop is caused by such a resistor to connect to the input port of the microcomputer 50 to detect the detection voltage. Is entered. As long as the terminal voltage of the battery can be detected, another circuit configuration may be used, or the battery terminal voltage may be arranged at another position.

  The microcomputer 50 compares the detection voltage output from the battery voltage detection circuit 20 with a plurality of reference voltages, and detects the degree of remaining battery capacity. For example, if it is higher than the first reference voltage, it is in the first stage charging state, and if it is lower than the first reference voltage and higher than the second reference voltage whose voltage is lower than the first reference voltage, the second stage charging is performed. If the voltage is lower than the second reference voltage, it is assumed that the charging state is in the third stage. In this embodiment, since the remaining capacity is displayed on the liquid crystal panel 11 in smaller increments, the remaining capacity detection by comparing the reference voltage and the battery voltage and the remaining capacity detection using a timer described later are used in combination.

  The charging control circuit 30 switches whether to supply the current from the charging adapter 31 according to the output corresponding to the remaining battery capacity from the microcomputer 50. In the above example, no current is supplied from the charging adapter 31 when in the first stage charging state, and current is supplied from the charging adapter 31 when in the other charging state.

  The motor 5 is a DC motor, and the rotational speed is determined by the magnitude of the voltage, and the torque is determined by the magnitude of the current. The motor 5 has the highest rotation speed when there is no load, and the rotation speed decreases when a load is applied. When the voltage applied to the motor 5 is increased, the rotational speed increases proportionally, and when the voltage applied to the motor 5 is decreased, the rotational speed decreases. The current supplied to the motor 5 is substantially proportional to the load torque, and the maximum current flows at the maximum torque.

  The drive voltage and current used for the motor 5 used in the electric razor are, for example, 0.1 to 0.4 [A] for a motor of 5.0 [V] and 0.7 to 0.7 for a motor of 3.6 [V]. It will be 1.2 to 1.4 [A] with a motor of 0.8 [A], 2.4 [V], and 1.5 to 1.8 [A] with a motor of 1.2 [V].

  Control of the motor 5 can be realized by changing the voltage applied to the motor 5. In order to change the voltage applied to the motor 5, it can be implemented by a circuit using a plurality of resistors, switch elements, a circuit using a plurality of diodes, switch elements, a circuit using variable resistors, or the like. However, since these circuits have large losses at resistors other than the motor 5 and are inefficient, in this embodiment, the average voltage is changed by changing the duty cycle of the pulse width using pulse width modulation. Apply the method you want. FIG. 5A shows a case where a voltage is constantly applied without providing a pulse off period. The motor 5 can be driven at a high rotation speed with the average voltage being the highest. FIG. 5B shows a case where a voltage is applied with a pulse off period, and the average voltage becomes smaller than in the case of FIG. 5A, and the motor 5 can be driven at a standard rotational speed. FIG. 5 (c) shows a case where a voltage is applied with the pulse OFF period longer than that in FIG. 5 (b). The average voltage is smaller than in the case of FIG. Can be driven. The pulse width modulation can be implemented by using the pulse width modulation circuit or by using the microcomputer 50. In the present embodiment, the latter is implemented by the latter. That is, the pulse width modulation function provided on the microcomputer 50 side is used.

  [Remaining Capacity Display] FIG. 6 is a cross-sectional view of the liquid crystal panel according to the present embodiment. However, the sectional view here is for showing each component, and the thickness of each component is not an actual ratio. The liquid crystal panel 11 includes, in order, a first polarizing plate 11a, a glass substrate 11b, a transparent conductive film 11c (pixel electrode), an alignment film 11d, a liquid crystal 11e, an alignment film 11f, a transparent conductive film 11g (counter electrode), a glass substrate 11h, It is comprised from the 2nd polarizing plate 11i. The arrangement of the molecular arrangement of the liquid crystal 11e changes depending on whether or not the voltage is applied to the opposing transparent conductive films 11c and 11g. The alignment films 11d and 11f are films that align liquid crystal molecules in a predetermined direction, and are made of, for example, a polyimide resin. The polarizing plates 11a and 11i allow light to pass only in a predetermined direction. In addition, since the liquid crystal 11e does not emit light directly, a backlight is required. In the present embodiment, three light emitting diodes 55a, 55b, and 55c are used as the backlight. In the liquid crystal display area of the liquid crystal display section 10 (see FIG. 3) in which the liquid crystal panel 11 is fitted with the liquid crystal fitting member 12 and the protective window 13, numbers, percentages, and plug marks indicating the remaining capacity are displayed in a segmented manner. “TURBO” and “SOFT” indicating the state and “CHARGE” indicating charging are displayed in a dot matrix system.

  FIG. 7 is an example of a display of a liquid crystal panel of an electric razor according to this embodiment. In the present embodiment, as the remaining capacity display during driving, percentage display is performed from 100 [%] to 10 [%] in increments of 10 [%] (display according to the arrow in FIG. 7A). The secondary battery 3 of the nickel metal hydride battery has a property that the terminal voltage increases as the charging time elapses, and the terminal voltage decreases at the charging time when fully charged. By detecting, the full charge of the secondary battery 3 can be determined. From full charge, the microcomputer 50 measures the usage time using a timer. Then, when the usage time exceeds each threshold, the remaining capacity corresponding to the threshold is determined. Here, not only the remaining capacity is determined based on the usage time, but the first reference voltage, the second reference voltage, and the detection voltage are detected, and the remaining capacity is determined based on the actual terminal voltage. . For example, when shifting from the remaining capacity of 40 [%] to the remaining capacity of 30 [%], not only the usage time satisfies the condition but also the condition that the terminal voltage is lower than the first reference voltage is required. . Further, when the remaining capacity of 20 [%] is shifted to the remaining capacity of 10 [%], not only the usage time satisfies the condition but also the condition that the terminal voltage is lower than the second reference voltage is required. . Furthermore, the determination of the remaining capacity based on the terminal voltage is prioritized over the determination of the remaining capacity based on the usage time. That is, when the terminal voltage is lower than the first reference voltage and the remaining capacity is determined to be 80 [%] based on the usage time, the remaining capacity is displayed in stages and 30 [%]. The remaining capacity of is displayed. Instead of shifting from the remaining capacity display of 80 [%] to the remaining capacity display of 30 [%], the remaining capacity display of 70 [%], 60 [%], 50 [%], and 40 [%] is usually displayed. If it is, the place that changes every 10 [minutes] is changed and displayed, for example, by 1 [minute]. In each percentage display, voltage application to the liquid crystal panel 11 may be continued during each display period (for example, 10 [minutes]), but voltage application to the liquid crystal panel 11 is performed only for a predetermined period during the display period, and thereafter It is also possible to adopt a configuration in which voltage application to the liquid crystal panel 11 is not performed until the percentage display.

  The determination of the remaining capacity based on the usage time and the determination of the remaining capacity based on the terminal voltage are performed at predetermined time intervals while the motor 5 is being driven (see FIG. 8). However, in the present embodiment, the determination of the remaining capacity based on the terminal voltage has an auxiliary role in determining the remaining capacity based on the usage time, and thus is configured only by the determination of the remaining capacity based on the terminal voltage. Compared to an electric razor, the period for determining the remaining capacity based on the terminal voltage can be set longer. In addition, in such a configuration, when the remaining capacity based on the usage time becomes a remaining capacity that requires the determination of the remaining capacity based on the terminal voltage, the terminal voltage at the time of another remaining capacity is determined. Compared to the cycle for determining the remaining capacity based on the terminal voltage, the cycle for determining the remaining capacity based on the terminal voltage can be configured to be shorter. Furthermore, at the time of other remaining capacity, it can also be set as the structure which does not perform judgment of the remaining capacity based on a terminal voltage at all. In FIG. 8, the determination of the remaining capacity based on the usage time and the determination of the remaining capacity based on the terminal voltage are made at the same time, but the remaining capacity may be determined asynchronously.

  The remaining capacity when the remaining capacity is displayed after the motor 5 is stopped is determined by the remaining capacity obtained immediately before the motor 5 is stopped by the determination of the remaining capacity based on the usage time and the determination of the remaining capacity based on the terminal voltage. Using the capacity, the remaining capacity is displayed even after the driving of the motor 5 is stopped. That is, in FIG. 8, the remaining capacity is displayed even after the motor 5 is stopped by the remaining capacity obtained at time tn.

  The remaining capacity is displayed not only when the motor 5 is driven, but also when the commercial AC voltage is applied from the power plug and the battery 5 is charged. When the remaining capacity display indicates the minimum 10 [%], when the state is changed to the charging state, the remaining capacity display during charging is changed from 10 [%] to 10 [%] contrary to the remaining capacity display during driving. ] The remaining capacity is displayed in increments of 100% (display in which the arrow in FIG. 7A is traced in reverse). At the time of charging, the microcomputer 50 measures the charging time using a timer. Then, when the charging time exceeds each threshold, the remaining capacity corresponding to the threshold is determined. In addition to the determination of the remaining capacity based on the charging time, the method for determining the full charge of the secondary battery 3 described in parallel is used. Then, the remaining capacity is determined by giving priority to the determination method of full charge. For example, even if it is 80 [%] when the remaining capacity is determined based on the charging time, it is 100 [%] when it is determined that the battery is fully charged by the full charge determination method. Similar to the display of the remaining capacity during use, the display does not change from 80 [%] to 100 [%] at a stretch, but instead displays 90 [%] and 100 [%]. In each percentage display, the voltage application to the liquid crystal panel 11 may be continued, but the voltage application may be intermittently applied to the liquid crystal panel 11 and displayed in a blinking manner so as to be distinguished from the remaining capacity display during driving. The light emitting diodes 55a, 55b, and 55c are turned off after a predetermined time (for example, 10 minutes) has elapsed since the charging was completed. The plug mark blinks when the charging adapter 31 needs to be charged, and a voltage is applied to the liquid crystal panel 11 so as to light up when the charging adapter 31 is inserted into the jack 7. The light emitting diode 55c emits light when the plug mark is blinking and lit.

  FIG. 8 is a timing chart of display control of the electric razor according to the present embodiment. In the case of displaying the remaining capacity during driving, while a driving current is supplied to the motor 5, a voltage is applied to the transparent conductive films 11c and 11g to orient the liquid crystal 11e, and the remaining capacity is indicated by a number. At the same time, the light emitting diodes 55a and 55b which are backlights are caused to emit light. By doing so, the liquid crystal panel 11 can be easily seen when the motor 5 is driven. The light emitting diodes 55a and 55b are located on the back side of the display area of the liquid crystal panel 11, and the light emitting diode 55c is located on the back side of the charge required sign area. When charging is not required, no voltage is applied to the transparent conductive films 11c and 11g with a sign of charge required, so that the light emitting diode 55c does not emit light. When the drive voltage to the motor 5 is stopped, the voltage application is stopped for the third set time (for example, 0.2 [seconds]) to the transparent conductive films 11c and 11g related to the remaining capacity display by numbers, A voltage is applied to the transparent conductive films 11c and 11g stopped again. At this time, light emission of the light emitting diodes 55a and 55b is maintained. After the first set time (for example, 2 [seconds]) has elapsed from the drive stop time, only the light emission of the light emitting diodes 55a and 55b is stopped, and the transparent conductive films 11c and 11g related to the remaining capacity display by numbers are the first. The voltage continues to be applied after the lapse of the set time of 1, and after the second set time has elapsed, the voltage application to the transparent conductive films 11c and 11g relating to the remaining capacity display by numbers is stopped. By doing so, the user can notice for a time other than the motor sound of the motor 5 that the motor 5 has stopped for the time being by stopping the voltage application for the short time (third set time) of the numerical remaining capacity display. Next, after the number remaining capacity display is restored, the light emission of the light emitting diodes 55a and 55b is stopped, and the remaining capacity display of the number is displayed without losing the high design nature of the electric razor. It can be carried out. Conventionally, the display of the remaining capacity by the numbers drawn in the display area of the liquid crystal panel 11 due to the light emission of the light emitting diode as a backlight has been an adverse effect and the design of the electric razor has been impaired. Although the user is less likely to pay attention to the electric razor when the motor 5 is driven, attention should be paid to the electric razor immediately after the drive is stopped, so that the high design nature inherent to the electric razor immediately after the drive is stopped should be maintained as much as possible. Is desirable, and can be realized by the liquid crystal display control of the present invention.

  Regardless of the remaining capacity display during driving and the remaining capacity display during charging, when the remaining capacity display indicates 10 [%], a plug mark for prompting connection of the charging adapter 31 is displayed on the display area of the liquid crystal panel 11. Is displayed blinking. The characters “CHARGE” indicating that charging is required are displayed following the “10%” display, which is a remaining capacity display by numbers.

  [Metallic display] The liquid crystal panel has alignment films 11d and 11f, and constitutes a TN liquid crystal panel in which light incident from the back surface is twisted by 90 ° through the liquid crystal. The first polarizing plate 11a is a transmissive polarizing plate, and the second polarizing plate 11i is a reflective polarizing plate. In the case where the first polarizing plate 11a and the second polarizing plate 11i are arranged with the transmission axes in parallel and no voltage is applied to the transparent conductive films 11c and 11g, the first polarizing plate 11a. The incident light transmitted through the second polarizing plate 11i is twisted by 90 °, and the polarization direction of the light incident on the second polarizing plate 11i is orthogonal to the transmission axis, and is totally reflected by the reflective polarizing plate of the second polarizing plate 11i. Will be displayed.

When the light emitting diodes 55a, 55b, and 55c emit light in such a metallic display, the metallic display is weakened by the luminance of the backlight, and the decorative effect is remarkably weakened as a metallic display. In both cases, it becomes difficult for the user to use it as a mirror.
However, in this embodiment, since the light emitting diodes 55a and 55b are turned off at an early stage immediately after the drive is stopped, the decoration effect immediately after use is enhanced, and the mirror can be used as a mirror.

[Circuit Configuration] The circuit diagram used in this embodiment is as shown in FIG. 9 and will be described next. A circuit relating to charging and remaining capacity display will be described later.
The motor 5 is connected to the collector of a Darlington-connected transistor 54a. The collector of the transistor 54c is connected to the base of the Darlington-connected transistor 54b. The base of the transistor 54c is connected to the output port of the microcomputer 50. When the power switch 52 is pressed and turned on, the microcomputer 50 outputs an on signal to the output port, and the transistor 54c is turned on by this on signal. When the transistor 54c is turned on, the transistors 54a and 54b of the Darlington circuit are also turned on. The base of the transistor 54b in the Darlington circuit is also connected to the collector of the transistor 54d, and the base of the transistor 54d is connected to the output port of the microcomputer 50. Therefore, the transistor 54d repeats switching by the output of the ON signal to the output port of the microcomputer 50. By doing so, the voltage applied to the motor 5 is pulsed, and duty cycle pulse width modulation is realized by changing the duty ratio of the pulse width.

The supply voltage from the secondary battery 3 is also supplied to the light emitting diodes 55a, 55b, and 55c provided between the microcomputer 50 and the secondary battery 3. Therefore, the light emitting diodes 55a, 55b, and 55c can be turned on by the control on the microcomputer 50 side.
Each time the select button 53 is pressed, the microcomputer 50 determines which state the mode is currently in, and lights “TURBO” and “SOFT” that match the mode in the liquid crystal display area. Not displayed in normal mode.

  In the present embodiment, there are high-speed rotation (for example, 4500 [rpm]) as the turbo mode, medium-speed rotation (for example, 4300 [rpm]) as the normal mode, and low-speed rotation (4100 [rpm]) as the soft mode. . As described above, the microcomputer 50 drives and controls the motor 5 by adjusting the average voltage by pulse width modulation.

  [Charging] The secondary battery 3 is a nickel metal hydride battery, and is provided in the main body case 1 vertically and in two. The two secondary batteries 3 are connected in series from battery terminals (not shown). As shown in FIG. 10A, the terminal voltage of the secondary battery 3 of the nickel metal hydride battery increases as the charging time elapses, and the terminal voltage decreases after the charging time when the battery is fully charged. The time when the terminal voltage of the secondary battery 3 decreases is detected, and the charging control unit 30 is configured to stop the current supply from the charging adapter 31.

  A circuit diagram of the charging adapter 31 and the charging control unit 30 shown in FIG. 4 is as shown in FIG. The charging adapter 31 is connected to the secondary battery 3 through the transistor 32, the diode 33 and the fuse 34. The collector of the transistor 35 is connected to the base of the transistor 32, and the base of the transistor 35 is connected to the charging adapter 31. When the current from the charging adapter 31 is supplied, the transistor 35 is turned on, Further, switching is performed so that the transistor 32 is turned on and a direct current is supplied to the secondary battery 3. The collector of the transistor 36 is also connected to the base of the transistor 35, and a switching signal from the microcomputer 50 can be inputted to the base of the transistor 36. If necessary, the microcomputer 50 outputs a switching signal to the base of the transistor 36, so that the transistor 36 is turned on and the voltage at the base of the transistor 35 is lowered to be turned off. When the transistor 35 is turned off, the transistor 32 is also turned off, so that no current is supplied to the secondary battery 3.

  The microcomputer 50 applies a voltage to the transparent conductive films 11 c and 11 g of the liquid crystal panel 11 in accordance with the switching, detects insertion of the charging adapter 31, and displays a plug mark on the display area of the liquid crystal panel 11. Further, it is detected that the charging adapter 31 is removed, and the plug mark is not displayed from the display area of the liquid crystal panel 11.

  In order to detect a point at which the terminal voltage of the secondary battery 3 falls below the peak value, the terminal voltage of the secondary battery 3 divided by the resistors 37a and 37b is used as shown in the circuit diagram. Input to O port. The microcomputer 50 converts the analog signal from the I / O port into a digital value by A / D conversion, detects the peak value, and switches to the base of the transistor 36 when the peak value is changed by a predetermined amount. A signal is output to stop the current supply to the secondary battery 3.

  [Remaining Capacity Display] FIG. 12 shows a specific circuit example for displaying the remaining capacity. In this circuit diagram, resistors 101 a and 101 b are connected to a line having the same potential as the terminal voltage of the secondary battery 3, and divided by the resistors 101 a and 101 b, and a battery voltage detection voltage Ve is input to the microcomputer 50. Further, the resistors 102a and 102b are connected to a line having the same potential as the voltage obtained by boosting the terminal voltage of the secondary battery 3 through a booster circuit such as a DC-DC converter, and a plurality of voltages are divided by the resistors 102a and 102b. A plurality of comparison voltages V1 and V2 are input. The microcomputer 50 compares the detection voltage Ve with the comparison voltages V1 and V2, thereby comparing the detection voltage Ve, which is substantially a battery voltage, with the comparison voltages V1 and V2 shown in FIG. The remaining capacity detection by comparing the reference voltage and the battery voltage and the remaining capacity detection using a timer are combined and conducted to the necessary terminals of the liquid crystal to notify the user of the remaining capacity.

  [Mode] As described above, the electric razor of the present embodiment has three modes of the normal mode, the turbo mode, and the soft mode (see FIG. 13B). In addition to these driving modes, as shown in FIG. 13A, as an electric razor mode, a DC mode driven by the supply current from the secondary battery 3 and a supply current from the charging adapter 31 are used. The driving mode includes a driving AC mode, a non-driving standby mode, a charging mode in which the secondary battery 3 is being charged with a supply current from the charging adapter 31, and a demonstration mode for testing driving and display.

In the standby mode, the power switch 52 is pressed and turned on to change to the DC mode. Conversely, when in the DC mode, the power switch 52 is pressed to turn it off, thereby changing to the standby mode. When in the standby mode, the charging adapter 31 is connected to receive a supply of current and shift to the charging mode. On the contrary, when in the charging mode, by removing the charging adapter 31, the supply of current disappears and the mode is changed to the standby mode. When in this charging mode, pressing the power switch 52 to turn it on changes the mode to the AC mode driven by the current from the charging adapter 31. Conversely, when in the AC mode, pressing the power switch 52 to turn it off changes the charging battery 31 to the charging mode in which the secondary battery 3 is supplied with current. When in the AC mode, the current supply source changes to the DC mode instead of the secondary battery 3 by removing the charging adapter 31. Conversely, when in the DC mode, connecting the charging adapter 31 changes the current supply source to the charging adapter 31 and changes to the AC mode.
Further, when in the DC mode, the power switch 81 is pressed and held to change to the demo mode. When in the demo mode, the charging adapter 31 is connected to change to the charging mode.

As described above, according to the electric shaver according to the present embodiment, when the user presses the power switch and the motor 5 is driven, the voltage is applied to the necessary terminals of the liquid crystal panel 11 in accordance with the driving and the liquid crystal is turned on. The remaining capacity display of the secondary battery 3 is revealed by light emission of the light emitting diodes 55a and 55b. On the other hand, when the motor 5 stops driving, voltage application to the necessary terminals of the liquid crystal panel 11 is performed for a short time in accordance with the driving stop. The voltage application is started again and the voltage application is started again, and after a while, the light emitting diodes 55a and 55b are quickly turned off and finally the voltage application to the necessary terminals of the liquid crystal panel 11 is completely stopped. The remaining capacity is displayed as usual. Immediately after use, the remaining capacity display on the liquid crystal is temporarily stopped to notify the user that the motor has stopped, and the remaining capacity display on the liquid crystal is immediately restored. Then the light emitting diodes 55a, 55b appears weakened residual capacity display off, use as a mirror as well as exhibit high design of the electric shaver becomes possible, it is possible to visually recognize the residual capacity display look closely at the same time.
Either the normally white mode that transmits light when voltage is not applied to the transparent conductive film, or the normally black mode that transmits light when voltage is applied to the transparent conductive film. Also good.

  [Protective Window Downward Slope] FIG. 14A is an enlarged view of FIG. 1A which is a side view of an electric razor. In FIG. 14A, as shown by a dotted line, a protective window (transparent liquid crystal protective panel) 13 is disposed so as to be inclined forward at the upper part of the main body with respect to the axis of the electric razor main body. Therefore, the soot coming down from the cut portion formed by the inner blade 4a and the outer blade 4b arranged in front is not easily attached to and deposited on the surface of the protective window 13, and the visibility of the liquid crystal display deteriorates due to the protective window 13 becoming dirty. Can be prevented. Here, the liquid crystal panel is disposed in parallel with the protective window 13. Even in the case where the protective window 13 is not provided and the liquid crystal panel is exposed, the same effect can be obtained by adopting a forward leaning posture at the upper part of the main body with respect to the axis of the main body similarly to the protective window 13. Can be demonstrated.

  Further, in FIG. 14, since the heel 1 g (eave) is formed on the front side of the upper end of the main body, it is possible to further prevent the trash from falling on the surface of the protective window 13. As shown in FIGS. 14B to 14D, it is possible to prevent the scum from falling regardless of the state of the electric razor. The ridge 1g is formed so that the razor head 2 can be tilted forward, and the upper end front of the main body case 1 is also extended forward in accordance with the movable region of the razor head 2. By utilizing this, 1 g can be constructed. Therefore, even when the razor head 2 is not movable, by forming the ridge 1g, it is possible to similarly prevent the scum from falling on the liquid crystal panel 11.

  Furthermore, in the present embodiment, a reflective polarizing plate is pasted on the back surface of the liquid crystal panel 11, and a transmissive polarizing plate is pasted on the front surface of the liquid crystal panel 11, and incident light is not applied when no voltage is applied. Since it is totally reflected by the reflective polarizing plate and can be used as a mirror surface, and this mirror surface is also inclined downward, as shown in FIG. 15, when the user faces an electric razor, the user The part below the face part at the face-to-face position can be seen, and the unshaved part of the front face of the face can be easily confirmed. If it is not arranged to be inclined downward, it is necessary to check the remaining shaving on the front face of the face by tilting the entire electric razor downward. In particular, if the mirror has a high reflectivity, it is possible to check the unshaved area without bringing the liquid crystal panel close to it, but if the reflectivity is not high, it is necessary to check the unshaved area. It is necessary to check the razor close, and there is a limit to using it with the electric razor tilted downward in such a close state. Therefore, when the reflectance is not as high as a mirror, it is effective to configure the liquid crystal panel 11 so as to be inclined downward.

  [Position of Grip and Liquid Crystal Display] As shown in FIG. 1 (c), the main body of the electric razor is configured such that the lower side 3/5 has substantially the same width when viewed from the front, and the upper side 2/5 faces upward. A liquid crystal display unit is disposed on the upper side of the main body, a power switch 52 and a select button 53 are disposed on the lower side of the main body, and the lower side of the main body is formed in a slender shape so that the user can naturally As shown in FIG. 16A, the hand usually covers the lower side of the main body and the upper side of the main body is not covered by the hand. Even when gripped in this way, the power switch 52 and the select button 53, which are operation means, are also arranged on the lower side of the main body, and do not hinder use. According to such a configuration in which the lower side of the main body is thin and easy to grip and the upper side of the main body on which the liquid crystal display unit is disposed is widened, the user does not cover the liquid crystal display area with the user's hand. The liquid crystal display can be seen with a natural grip even if it is not held so that the finger is not placed on the windshield 13 so that the oil on the hand adheres to the windshield 13 and the liquid crystal display can be seen. It is less likely to become difficult.

(Other embodiments)
[Longer LED Light Emission Time According to Remaining Capacity] In the electric shaver according to the first embodiment, the light emission time of the light emitting diodes 55a and 55b after the drive is stopped regardless of the remaining capacity of the secondary battery 3. The light emission time of the light emitting diodes 55a and 55b can be made variable according to the remaining capacity, and the user can increase the light emission time of the light emitting diodes 55a and 55b as the remaining capacity decreases. It can be noted that the remaining capacity is small. In particular, in the present embodiment, the display area of the liquid crystal display unit 10 can be used as a mirror. However, when the light emitting diodes 55a and 55b emit light, the reflectivity of the mirror is reduced, so that the user can reduce the light emission time. You will notice sensitively for a long time.
Here, the light emission time of the light emitting diodes 55a and 55b is made variable according to the remaining capacity. However, the light emission after the drive is stopped only when the remaining capacity is equal to or less than a predetermined threshold (for example, when charging is required). A configuration in which the light emission time of the diode is lengthened can also be made, and it is possible to reliably notify the user that the remaining capacity is equal to or less than a predetermined threshold.

[LED blinking display when remaining capacity is equal to or less than predetermined threshold] In the electric shaver according to the first embodiment, no matter what [%] the remaining capacity of the secondary battery 3 is, only the presence or absence of light emission. However, the light emission of the light emitting diodes 55a and 55b after the drive stop may be blinked and displayed only when the remaining capacity is below a predetermined threshold (for example, when charging is required). It is possible to reliably notify the user that the remaining capacity is equal to or less than the predetermined threshold. In particular, in the present embodiment, the liquid crystal display unit 10 can be used as a mirror. However, when the light emitting diodes 55a and 55b emit light, the reflectivity of the mirror is lowered, so that the user is sensitive to blinking display. notice.
Further, the flashing cycle of the light emitting diodes 55a and 55b can be made variable according to the remaining capacity, and the remaining capacity is reduced for the user by shortening the flashing cycle of the light emitting diodes 55a and 55b as the remaining capacity decreases. You can be sure that there is little.

  [Inverted display of liquid crystal when remaining capacity is below predetermined threshold] In the electric shaver according to the first embodiment, in the liquid crystal display, the remaining capacity display by numbers and the required charge display by characters are performed. However, the display area of the liquid crystal panel 11 of the electric razor is limited due to the size of the electric razor, which is a small electric device, even if it is to be formed large. It may not be transmitted to. In particular, as in the present embodiment, when the segment method is partially adopted for the entire display area instead of the dot matrix display, a large display cannot be achieved with the dot matrix display. In the case of such a small electric device such as an electric razor, in order to notify that the remaining capacity is equal to or less than a predetermined threshold, when the current liquid crystal display shifts to a state of remaining capacity equal to or less than the predetermined threshold. By reversing the display of the liquid crystal, the user can be surely notified. In particular, in this embodiment, the liquid crystal display unit 10 can be used as a mirror. However, when the LED emits light, the reflectivity of the mirror changes, so the user is sensitive to the inverted display of the liquid crystal. In addition, when characters and figures are displayed negatively, the area other than the characters and figures can be used as a mirror. However, by inverting the display, most of the display area can be used as a mirror. Therefore, the user is particularly aware of the reversed display of the liquid crystal.

  [Indicator Display According to Remaining Capacity] In the electric shaver according to the first embodiment, numbers and figures are displayed in the display area of the liquid crystal display unit 10, but can be used as an indicator as a remaining capacity display. When the remaining capacity display is displayed as positive, when the display area is used as a mirror, the entire area can be used as a mirror when the remaining capacity is fully charged (see FIG. 16B). On the contrary, when the remaining capacity becomes close to the required charging, most of the area cannot be used as a mirror (see FIG. 16E), and the user can notice the remaining capacity strongly. Since the area that can be secured as the liquid crystal display unit 10 by the electric razor is limited, the display as such an indicator is easily noticed by the user.

  [Remaining Usable Time Display] In the electric shaver according to the first embodiment, the remaining capacity obtained based on the determination of the remaining capacity based on the usage time and the determination of the remaining capacity based on the terminal voltage is displayed on the liquid crystal panel 11. The remaining capacity here is, for example, the ratio of the actual remaining capacity [Ah (ampere hour)] of the secondary battery 3 to the actual total capacity [Ah (ampere hour)] of the secondary battery 3, for example. The remaining usable time indicating the remaining usable time without charging the razor on the way can be displayed on the liquid crystal panel 11 as the remaining capacity display. For the remaining usable time itself, for example, the total use time is obtained in advance from the actual total capacity of the secondary battery 3 arranged in the electric razor, and the use time from the fully charged time is subtracted from the obtained total use time. Can be obtained.

In the electric razor, the secondary battery 3 is not necessarily charged in a state where the remaining capacity is completely removed, and may be charged even when half of the remaining capacity remains. Further, the secondary battery 3 may change over time, and even when fully charged, it may not be able to recover to the actual total capacity at the time of purchase of the electric razor. In doing so, an error may occur when the remaining usable time is determined by the above-described method, but as in the first embodiment, the determination of the remaining capacity based on the terminal voltage is performed at a predetermined period, It is desirable to display the remaining capacity by giving priority to such determination. In this case, the usage time when the detection voltage falls below the reference voltage is determined in advance. Specifically, as an example, when the detected voltage falls below the first reference voltage, the remaining usable time is set to 20 [minutes], and when the detected voltage falls below the second reference voltage, the remaining usable time can be used. The time can be set to 5 [minutes].
Furthermore, when the remaining capacity is displayed with priority given to the remaining capacity based on the terminal voltage in a state where the usage time is too short, the total capacity that the secondary battery 3 can secure by aging has greatly decreased. Therefore, in such a case, it is desirable to draw a display for prompting replacement of the secondary battery on the liquid crystal panel 11.

  [Change in emission color when remaining capacity is equal to or less than predetermined threshold value] In the electric shaver according to the first embodiment, the emission color of the light emitting diodes 55a and 55b, which are backlights, was not explained. It is also possible to adopt a configuration in which the emission color is changed between a normal remaining capacity display that is not a charge required display and a charge required display. By doing so, it is possible to more reliably notify the user of the required charging. Here, for example, in the case of a normal remaining capacity display, a blue light emission color is used to bring about a normal state, and in the case of a charge required display, a red light emission color is used to indicate that the user needs to be dealt with.

  [Change in Luminous Intensity when Remaining Capacity is Less than or equal to Predetermined Threshold] In the electric shaver according to the first embodiment, the luminous intensity of the light emitting diodes 55a and 55b that are backlights is not explained. It is also possible to adopt a configuration in which the light emission intensity is changed between a normal remaining capacity display that is not a charge required display and a charge required display. In addition, the light emission intensity can be changed according to the remaining capacity. In the present embodiment, the liquid crystal display unit 10 can also be used as a mirror, and the mirror effect decreases as the light emission intensity increases, so that the user is well informed of the inconvenience that cannot be used as a mirror. Can do.

  [Performance Time of Judgment of Remaining Capacity Based on Terminal Voltage] In the electric shaver according to the first embodiment, the judgment time of the remaining capacity judgment based on the terminal voltage is shown in the battery capacity detection timing chart of FIG. As described above, it is carried out every predetermined time between the start of driving of the motor 5 and the stop of driving of the motor 5, and the remaining capacity display of the stop of driving of the motor 5 is the remaining capacity obtained immediately before the stop of driving of the motor 5. However, as shown in the pulse indicated by the alternate long and short dash line in the battery capacity detection timing chart of FIG. 8, the remaining time is substantially the same as the stop time of the motor 5 and within the voltage application stop period of the liquid crystal panel 11. It is also possible to adopt a configuration in which the remaining capacity obtained by determining the capacity and displaying the remaining capacity when the voltage application to the liquid crystal panel 11 is resumed is displayed. By doing so, it is possible to detect the remaining capacity in the state where the terminal voltage of the secondary battery 3 after the drive of the motor 5 is stopped, that is, after the power supply to the motor 5 is stopped, is restored. The capacity can be displayed on the liquid crystal panel 11.

  Although the present invention has been described with the above embodiments, the technical scope of the present invention is not limited to the scope described in the embodiments, and various modifications or improvements can be added to these embodiments. . And embodiment which added such a change or improvement is also contained in the technical scope of the present invention. This is apparent from the claims and the means for solving the problems.

It is the external appearance 6th view and AA arrow sectional drawing of the electric shaver which concerns on the 1st Embodiment of this invention. It is a perspective exploded view of the electric razor which concerns on the 1st Embodiment of this invention. It is a perspective exploded view of the liquid crystal display part related parts of the electric razor which concerns on the 1st Embodiment of this invention. It is a block block diagram of the electric shaver which concerns on the 1st Embodiment of this invention. It is comparison explanatory drawing of the duty ratio of the pulse width of the electric shaver which concerns on the 1st Embodiment of this invention. It is sectional drawing of the liquid crystal panel which concerns on the 1st Embodiment of this invention. It is an example of the display of the liquid crystal panel of the electric shaver which concerns on the 1st Embodiment of this invention. It is a timing chart of the display control of the electric shaver which concerns on the 1st Embodiment of this invention. It is a circuit diagram of the electric shaver which concerns on the 1st Embodiment of this invention. It is charge of an electric shaver which concerns on the 1st Embodiment of this invention, and charging display explanatory drawing. It is a circuit diagram of the charge adapter and charge control part which concern on the 1st Embodiment of this invention. It is an example of the circuit for the remaining capacity display which concerns on the 1st Embodiment of this invention. It is a state transition diagram of the mode of the electric shaver which concerns on the 1st Embodiment of this invention. It is the side enlarged view and use explanatory drawing of the electric shaver which concerns on the 1st Embodiment of this invention. It is use explanatory drawing of the electric shaver which concerns on other embodiment of this invention. It is usage explanatory drawing and indicator remaining capacity display explanatory drawing of the electric shaver which concerns on other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body case 1a Front cover 1b Front exterior body 1c Front interior body 1d Rear interior body 1e Rear exterior body 1f Rear cover 1g 庇 2 Razor head 2a Bottom cover 2b Decoration member 3 Secondary battery 3a Battery case 4a (arranged in front) Inner blade 4b Outer blade 4c (arranged in front) Inner blade 4d (arranged in rear) Outer blade 5 Motor 6 Outer blade holder 7 Jack 8 Deflection section 8a Deflection start section 8b Deflection knob 8c Deflection Receiving part 9 Outer blade holder removal button 10 Liquid crystal display part 11 Liquid crystal panel 11a First polarizing plate 11b Glass substrate 11c Transparent conductive film 11d Alignment film 11e Liquid crystal 11f Alignment film 11g Transparent conductive film 11h Glass substrate 11i Second polarizing plate 12 Liquid crystal fitting member 13 Protective window 20 Battery voltage detection Circuit 30 Charge control circuit 31 Charge adapter 32 Transistor 33 Diode 34 Fuse 35 Transistor 36 Transistor 37, 37a, 37b Resistor 50 Microcomputer 51 Circuit board 52 Power switch 52a Power switch cover 53 Select button 53a Select button cover 54 Switch 54a Transistor 54b Transistor 54c Transistor 54d Transistor 55a Light-emitting diode 55b Light-emitting diode 55c Light-emitting diode 74 Boost circuit 75a Resistor 75b Resistor 101a Resistor 101b Resistor 102a Resistor 102b Resistor

Claims (5)

A secondary battery as a drive source; a motor to which drive power is supplied using the secondary battery as a drive source; operating means for switching on and off the supply of drive power to the motor; and the remaining capacity of the secondary battery A remaining capacity detecting means for detecting the light, a liquid crystal panel that switches the presence or absence of light transmission according to the voltage application state, and a backlight that emits light from the back of the liquid crystal panel
A reflective polarizing plate is disposed on the backlight side of the liquid crystal panel, and a transmissive polarizing plate is disposed on the opposite side,
The liquid crystal panel performs a remaining capacity display of the detected remaining capacity in the negative part,
During the power supply to the motor, the remaining capacity is displayed according to the remaining capacity detected by the remaining capacity detecting means by applying a voltage to the liquid crystal panel and emitting a backlight.
A small electric device that turns off the backlight after a first set time has elapsed since the power supply to the motor is stopped, and further stops the voltage application to the liquid crystal panel after the second set time has elapsed. A secondary battery as a drive source; a motor to which drive power is supplied using the secondary battery as a drive source; operating means for switching on and off the supply of drive power to the motor; and the remaining capacity of the secondary battery A remaining capacity detecting means for detecting the light, a liquid crystal panel that switches the presence or absence of light transmission depending on the voltage application state, and a backlight that emits light from the back of the liquid crystal panel,
A reflective polarizing plate is disposed on the backlight side of the liquid crystal panel, and a transmissive polarizing plate is disposed on the opposite side,
The liquid crystal panel performs a remaining capacity display of the detected remaining capacity in the negative part,
During the power supply to the motor, the remaining capacity is displayed according to the remaining capacity detected by the remaining capacity detecting means by applying a voltage to the liquid crystal panel and emitting a backlight.
After the power supply to the motor is stopped, the voltage application to the liquid crystal panel is temporarily stopped for the third set time, and the voltage application to the liquid crystal panel is resumed after the third set time has elapsed, and the power supply is stopped. A small electric device that turns off the backlight after a first set time, which is a set time equal to or greater than a third set time, and stops applying a voltage to the liquid crystal panel after the second set time has elapsed. The small electric device according to claim 1 or 2, wherein the liquid crystal panel is disposed so that a display area of the liquid crystal panel is positioned at a central portion above the grip . The small electric device according to any one of claims 1 to 3.
A protective window for protecting the display area of the liquid crystal panel is disposed at an acute angle downward with respect to the device center line in a side view,
An electric shaver that drives the inner blade by driving the motor. A secondary battery serving as a drive source; a motor to which drive power is supplied using the secondary battery as a drive source; an inner blade; operating means for switching on / off the supply of drive power to the motor; A remaining capacity detecting means for detecting the remaining capacity of the secondary battery, a liquid crystal panel that switches the presence or absence of light transmission according to a voltage application state, and a backlight that emits light from the back of the liquid crystal panel,
A reflective polarizing plate is disposed on the backlight side of the liquid crystal panel, and a transmissive polarizing plate is disposed on the opposite side,
The liquid crystal panel performs a remaining capacity display of the detected remaining capacity in the negative part,
An electric razor in which a protective window for protecting the display area of the liquid crystal panel is disposed at an acute angle downward with respect to the device center line in a side view.

Images