JPS6156492B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a display system for displaying photographic information, etc. in the viewfinder of a camera. The present invention relates to a display method that can provide an easy-to-read display regardless of whether the camera is in the horizontal or vertical position when displaying photographing information and the like.

Conventionally, when displaying shooting data numerically,
For example, a device designed to always display numbers in the correct display format taking into account the camera's posture was developed by Japanese Patent Publication No.
It has been proposed in No. 54-24818, Japanese Patent Application Laid-open No. 54-23521, etc. In these conventional devices, the prism is rotated to match the orientation of the camera, and the display itself is rotated, resulting in a larger configuration.
In reality, this was not suitable for cameras that required miniaturization.

The present invention has been made in view of the above-mentioned matters, and by changing the conversion mode by a decoder that decodes display data into a signal for displaying numbers depending on the attitude of the camera, it is possible to change the display mode when the camera is in the forward or reverse direction. This makes it possible to always display in the normal display mode even in the case of The purpose is to provide a display device suitable for.

The present invention will be explained in detail below with reference to the drawings. FIG. 1 is a diagram showing the positional relationship between the viewfinder mask and the display within the viewfinder observed through the eyepiece in the horizontal and vertical positions when photographing at eye level with a camera (35 mm single-lens reflex). The general shooting posture can be roughly divided into horizontal position 1 and vertical position as shown in the upper part of the figure, and vertical position 2 is when the pentaprism is on the left side of the photographic lens and 3 is when it is on the right side. It can be divided into If you observe the viewfinder through the eyepiece in these positions, the subject image will be erect up, down, left, right, and above in any case. However, with conventional cameras, the display method in the viewfinder shows numerical symbols, etc. erect in the horizontal position. In the vertical position, it remains facing left or right, making it difficult to see.

FIG. 2 is a diagram showing an example of the viewfinder display for each posture using the viewfinder display method according to the present invention. In the case of horizontal position 1, data is displayed horizontally along the lower long side of the mask on the screen on display A. If the vertical position is 2, it will be displayed on display B as a horizontal line along the lower short side of the screen, and if the vertical position is 3, it will be displayed on display B. This is displayed as numerical codes arranged along the upper short side of the screen, and these numerical codes are arranged so that they can be read from left to right in any case. In order to do this, two light emitting element rows A and B are required, and these element rows are digitally controlled 7 segment LEDs or dot patterns.
It can be constructed using LEDs.

Fig. 3 is a diagram showing the display in the viewfinder for each posture when using another embodiment of the display method of the present invention. This is the case when a single element array is used. In this method, the position of the display element remains the same in horizontal position 1 and vertical positions 2 and 3, but the direction of the displayed numerical codes is changed horizontally from the left in the horizontal position, and vertically from the top in the vertical position. It is something.

FIG. 4 is a structural diagram showing an embodiment of a switch fixedly disposed within a camera to automatically detect the attitude of the camera. As shown in the figure, the switch is a well-known mercury switch in which an appropriate amount of conductive fluid (such as mercury) is sealed in a hollow glass tube, and a pair of electrodes are provided at each end of the tube. It is constructed by arranging a protruding part. When this switch structure is placed in a horizontal position, mercury flows into the central annular protrusion and both the left and right electrodes become open, but when this switch structure is placed in a vertical position, a short circuit occurs between the electrodes located below. and the other electrode is left open. Therefore, if this switch structure is fixed to a device in a horizontal position and the device is held in a horizontal position, the switch will be turned off, and if the device is placed in a vertical position, either one of the electrodes will be turned on. , will act as a changeover switch. Note that by making the central protrusion into an annular shape, the switch-off state can be maintained even if the device (that is, the camera) is directed upward or downward. FIG. 5 shows an embodiment of the display system of the present invention in which the switch structure shown in FIG. 4 is arranged horizontally at an appropriate position within the camera, and light emitting element rows are arranged along the two sides of the viewfinder pentaprism. It is a principal part perspective view which shows an example. In the figure, 1 is a pentaprism, 2 is a condenser lens, 3 and 4 are displays A and B each consisting of a row of light emitting elements, and 5
is a mercury switch for attitude detection.

Next, FIG. 6 is a circuit connection diagram showing an embodiment of the display system according to the present invention, in which 7-segment LEDs are used as two displays. Input terminal 1
A digital signal of photographing information is input to 00 from the arithmetic circuit. Reference numeral 101 denotes a register multiplexer for generating display signals, into which a clock signal and a scanning signal are input, and creates signals A, B, C, and D from digital photographic information from 100, and sends them to a decoder 102 from their respective output terminals. decoder 10
2 is also scanned by the scanning signal and has 7 segments.
Signals a to g for LED display are output from respective output terminals. 103 is a segment driver and its output is 7 segment LED display A or B
to emit light. SW ₁ and SW ₂ are the attitude switches shown in Figure 4 above, and when the camera takes horizontal position 1,
Both SW ₁ and SW ₂ are off, and in the case of vertical position, SW ₁ is off, SW ₂ is on, and attitude 2 is on.
In this case, SW ₁ is on and SW ₂ is off. G ₁
is EX−NOR gate, I ₁ is inverter, G ₂ is
It is an AND gate. Furthermore, G ₃ to _{G 6} are digital drivers 104 that drive the 4-digit LED display A.
, R ₃ to R ₆ are resistors, and Tr ₁ to _{Tr 4} are drive transistors for each digit. Further, _I2 is an inverter, and the output of the inverter and the scanning signal are input to the digital driver 105. The configuration of the digital driver 105 is the same as the digital driver 104, and includes AND gates _G7 to _G10 , resistors _R7 to _R10 , and transistors _Tr5 to It is composed of Tr ₈ and its output drives each digit of the 4-digit LED display B.

Next, the operation of the circuit shown in FIG. 6 will be explained. When the camera is in the horizontal shooting position, both switches SW ₁ and SW ₂ of the attitude detector are turned off, and the EX-NOR
The output of gate _G1 becomes logic “1” (high level), and each AND of digital driver 104 is now
The output of gates G ₃ to _{G 6} becomes “1” every time a scanning signal comes, and the output of Tr ₁ to _{Tr 4} turns into a 7-segment LED.
The display device A consisting of the following is driven. Furthermore, since "0" is input to the digital driver 105 via the inverter _I2 , the digital driver 105 becomes inoperative and the display B does not operate. Since the output " ₁ " of G1 is input to the decoder 102 and the "0" signal is input from the AND gate _G2 , the decoder 102 receives the normal code output a~
g and sends it to the segment driver 103
It is sent to each segment LED of display unit A via.
Therefore, in the horizontal position, the display device A will display the erect numerical code by emitting light, and the digits will also emit light sequentially from left to right in accordance with the scanning signal. Since the light emitted from the display A is arranged along the long side of the screen within the viewfinder, the photographer can read the photographic information arranged horizontally through the eyepiece.

Next, if you set the camera to landscape position 3,
Attitude detector switch SW ₁ is turned off and SW ₂ is turned on. As a result, the output of EX-NOR gate _G1 becomes "0", the digital driver 104 becomes inactive, the display A does not light up, and the output of _G1 becomes "0".
becomes "1" through the inverter _I2 , operating the digital driver 105 and putting the display B into the operating state. Further, "1" is inputted to the decoder 102 from the AND gate _G2 , and "0" is inputted from the AND gate _G1 . The code signals a to g output from the decoder output signals that cause the segment LEDs of the display device B to emit light by inverting them vertically and horizontally. Therefore, in this case, display B is the output of digital driver 105.
When each digit is scanned from left to right, the digits are always flipped vertically and horizontally, and when viewed through the eyepiece, erect digits are lined up along the top short side of the image in a row from left to right. will be displayed.
Further, when a state such as posture 2 in the vertical position is reached, the switch of the posture detector is SW ₁ turned on and SW ₂ turned off.
In this case as well, the output of the EX-NOR gate G ₁ is “0” and the digital driver 105 operates and the display B emits light, but the “0” signal is input to the decoder 102 from the AND gate G ₂ . , "0" is input from _G1 . The code signals a to g of the decoder output at this time are signals that cause each segment LED to emit an upright code, and therefore, together with the output of the digital driver 105, the display B emits an upright code from left to right. . When you look at this through the eyepiece, the shooting information will be displayed along the lower short side of the image, erect and from the left. As described above, when using the circuit shown in Figure 6, the information in the viewfinder is always displayed with numerical signs that are erect in the horizontal direction, regardless of whether the camera is in horizontal position 1, vertical position 2 or 3. information can be viewed.

An embodiment of the present invention using two sets of 7-segment displays has been described above, but when a dot pattern is used for the display, the two displays can be switched in the same manner to display erect and horizontal light emitting elements. It is possible to obtain Furthermore, when a dot pattern or a square segment LED is used, the display in each posture can be displayed in an easy-to-read position using one display device, as shown in FIG. 3. A description of the display posture switching circuit in this case will be omitted.

As described above, in a camera using the display method of the present invention, by changing the shooting posture to the horizontal or vertical position, the display in the viewfinder can be displayed in an easy-to-see position with upright numerical symbols, and the camera In use, it is possible to obtain a very clear display of photographic data, which is very effective.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the relationship between the shooting posture of a conventional single-lens reflex camera and the display in the viewfinder.
The figure is a diagram showing the relationship between the shooting posture and the viewfinder display method of the viewfinder display method according to the present invention.
FIG. 4 is a diagram showing a viewfinder display according to another embodiment of the present invention, and FIG. 4 is a structural diagram showing an embodiment of a camera shooting attitude detector used in the display method of the present invention.
FIG. 5 is a diagram showing the arrangement of the display section in a single-lens reflex camera using the display method of the present invention, and FIG.
The figure is a circuit connection diagram showing an embodiment of the display method of the present invention. 1... Pentaprism, 2... Condenser lens, 3... Display A, 4... Display B, 5...
Attitude detection switch, 100...Display information input terminal, 101...Register multiplexer, 1
02...Decoder, 103...Segment driver, 104, 105...Digital driver, 106, 107...Display device.

Claims (1)

[Claims] 1. A display device having a number display element arranged in a row of multiple digits and fixedly arranged on the camera, a display signal forming circuit that outputs a display data signal, and a display signal forming circuit that outputs the data signal from the display signal forming circuit. In a camera display device that is equipped with a decoder that converts the code signal into a code signal for displaying a number by a device, the output of the decoder drives the number display element of each digit to display the number. A switch means is provided for indicating a first state when the camera is in a first photographing position and a second state when the camera is in an opposite position to the first photographing position, and the switch means is connected to the decoder. When the connected switch means is in the first state and when it is in the second state, the conversion manner of the data signal by the decoder is different, and the display state of the numeric display element is indicated by the switch means in the first state. A display device for a camera, characterized in that a display state when a second state is shown is vertically and horizontally reversed with respect to a display state when the second state is shown.