JP2531176B2 - camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a camera that performs filter switching and film winding and rewinding using a common drive source.

B. Conventional Technology Conventionally, a CCD, which is a type of solid-state image sensor, is generally used as a focus detection element of an autofocus (AF) device. Here, the CCD has sensitivity to visible light and infrared light, and the dynamic range on the high brightness side is EV.
It is about 18. On the other hand, the light used in ordinary photography is light in the visible light region, and normally, it is desirable that the focus detection operation in the AF device of the camera is performed on this light in the visible light region. However, in photographing using daylight including visible light and infrared light, there is a property that infrared light and visible light are focused on different positions due to chromatic aberration of a lens. Therefore, if the subject light is guided to the AF optical system as it is for focus detection operation, the CCD is affected by infrared light, and accurate focus detection for visible light cannot be performed.

For this reason, there has been conventionally proposed a camera that inserts an infrared cut filter in the AF optical path to guide only visible light to the CCD. On the other hand, in photographing a dark subject using an electronic flash, focus detection is performed by irradiating the subject with auxiliary light for focus detection. As this auxiliary light, light having a wavelength in the infrared region is used because it is not noticeable during shooting and the light emitting diode (LED) used as a light source has high luminous efficiency. It is common. Therefore, in focus detection using such an auxiliary light source, it is necessary to insert a filter that transmits infrared light matching the wavelength of the auxiliary light source into the AF optical path. The characteristics of this filter are different from those of the filter used during daylight photography described above. That is, it is necessary to use an infrared cut filter for daylight and a filter having infrared light transmissivity when using an electronic flash device, and these two conditions are contradictory. Therefore, in AF devices for cameras that have been commercialized and are commercially available in the past, a single filter that transmits visible light and some infrared light is inserted in the AF optical path.

In such a conventional AF device, the focus detection error is small enough not to cause a problem with a taking lens whose chromatic aberration is not so large, but it is ignored for a relatively large chromatic aberration such as a telephoto lens. There is a problem in that an inaccurate focus detection error may occur, and accurate focus cannot be obtained.

In order to solve this, there has been proposed a filter switching device that switches and inserts the above-mentioned two filters in the AF optical path according to the shooting conditions. That is, in daylight photography, a strong infrared cut filter that transmits only visible light is used for AF.
In the case of shooting using an electronic flash device, which is inserted in the optical path, a weak infrared cut filter that transmits auxiliary light that is infrared light is inserted in the AF optical path.

By the way, as a filter switching device of this type, the applicant of the present invention has shown in FIGS. 12 (a) and 12 (b) in JP-A-60-178417.
The following are suggested.

This is to switch six filters according to the following conditions a to f.

a: When subject brightness is low b: When subject brightness is normal c: When subject brightness is high and infrared light is strong d: When subject brightness exceeds the dynamic range of the CCD e: When infrared film is used f: Infrared When detecting the focus by projecting light, that is, in FIG. 12 (a), the optical block of the AF device is attached to the camera body below the mirror box floor 612C.
636 is provided to guide the subject light incident from the opening 637 to the focus position detection element 640. A filter 630 is provided so as to face the opening 637 and blocks undesired infrared light in accordance with photographing conditions.

This filter 630, as shown in FIG.
Filters 630a to 630f having various transmission characteristics are housed in a filter holder 632, and are rotatable around a shaft 633. Switching between these filters 630a to 630f is performed by the roller 6 pressed against the outer periphery of the filter holder 632.
Rotate 50 by motor 648. For example, filter 6
When using 30b, the motor 648 rotates the roller 650 to rotate the filter holder 632 counterclockwise and move the filter 630b so that it is located above the incident surface of the AF optical block 636. Insert inside.

C. Problems to be Solved by the Invention By the way, conventionally, a camera for winding or rewinding a film by a motor is known.
When the filter switching device shown in the twelfth (a) and (b) is installed, if the filter switching motor 648 and the film winding or rewinding motor are driven at the same time, the battery will be exhausted significantly, which is not preferable. Therefore, if a filter switching motor is prioritized over a film winding motor when a command to drive two motors at the same time is output, during that time, the shutter may not be released and a shutter chance may be missed. Further, if winding is performed after switching the filters, the shooting conditions may change during that time, and the filter switching motor may have to be driven again. That is, it is preferable to switch the filters at a time as close to the shooting timing as possible.

On the other hand, if the filter switching motor is prioritized over the film rewinding motor, when the lens cap is put on after the film rewinding, the filter switching motor is re-driven and useless battery consumption occurs. Further, in a camera in which the rewinding motor is activated in response to a manual operation of the camera user, the film rewinding is interrupted against the user's intention, which is not convenient.

An object of the present invention is to provide a camera capable of switching filters without increasing the number of parts, and the switching operation is not complicated.

D. Means for Solving the Problems The present invention provides a photographing lens for a subject, which is arranged below a mirror box that accommodates a mirror and is based on subject light that passes through the photographing lens and is incident through the mirror. The present invention is applied to a camera equipped with a focus detecting means for detecting the in-focus state of.

It is arranged between the mirror and the focus detection means, and is displaceable between a position where the subject light enters the optical path leading to the focus detection means and a position where the subject light retracts from the optical path, and the focus is set at the entrance position. It includes a filter means for selecting the incident light to the detection means, a feeding means for feeding the film loaded in the camera, and a forward and reverse reversible motor arranged below the cartridge chamber. And a drive control means for causing the filter means to perform a displacement operation in response to the reverse rotation of the motor.

E. Action In the present invention, since the displacement of the filter means and the rewinding of the film are performed by the common motor, it is not necessary to separately provide a motor for driving the filter means, and the number of camera parts can be reduced. Further, since the filter means is moved into and out of the optical path only by rotating the motor in one direction (forward rotation),
The switching operation of the filter means is simplified.

F. Embodiment An embodiment will be described with reference to FIGS.

FIG. 2 is a sectional view of the camera, showing a state in which the subject can be observed from the viewfinder. Reference numeral 12a is a hot chute for attaching the electronic flash to the camera body 12.
Reference numeral 14 is a main reflecting mirror having a semi-transmissive portion in the center, and is rotatably supported by the camera body by a rotating shaft 14a provided at one end thereof. A sub-reflecting mirror 16 is provided behind the semi-transmissive portion of the main reflecting mirror 14, and is rotatably supported with respect to the main reflecting mirror 14 by a turning shaft 16a provided at one end. Reference numeral 18 is a focusing screen, 20 is a pentaprism, and 22 is a fan-ider eyepiece. 30 is a filter, 32
Is a filter holder and 34 is a filter cover.
36 is an optical block of the autofocus device, 38 is an AF diaphragm, 40 is a focus detection element of the AF device, and 42 is a light receiving element for photometry. These parts are arranged below the mirror box floor 12c so as not to interrupt the photographing light flux. 2
Reference numeral 4 is a shutter unit, and 26 is an aperture of the photographing screen. Behind the aperture 26, a film 28 accommodated in the film passage 12b of the main body is arranged. 2
4a is a group of shutter front blades divided into several sheets, which are expanded to close the aperture 26 and folded to fold the aperture.
Open 26 and expose film 28. Further, 24b is a rear blade group of the shutter which is also divided into several sheets, and is extended to close the aperture 26 and finish the exposure.

At the time of observing a subject, the photographing light passes through the photographing lens 10, is reflected by the main reflecting mirror 14, reaches the focusing screen 18, the pentaprism 20, and the eyepiece lens 22, and the subject image can be observed from the viewfinder. Further, the light passing through the semi-transmissive portion of the main reflecting mirror 14 is reflected by the sub-reflecting mirror 16, passes through the filter 30, and is then guided to the optical block 36 of the AF device. Part of the light that has entered the optical block 36 is guided to the light receiving element 42 for photometry, the subject brightness is measured, and exposure information is obtained. Some other light
The focus information is guided to the focus detection element 40 of the AF device, and based on the image signal from the element 40, focus detection calculation is performed to obtain focus information such as focus, front focus, and rear focus.

When shooting a subject, the main reflecting mirror 14 and the sub-reflecting mirror 16
Each of them rotates about the shafts 14a and 16a and retracts out of the photographing optical path as shown by the broken line in FIG. Next, the shutter leading blade group 24a is folded down to open the aperture 26, the film 28 is exposed, and photographing is performed.
After that, the rear shutter blade group 24b is expanded and the aperture 2
6 is closed, and at the same time as this, the main and sub-reflecting mirrors 14 and 16 return from the positions indicated by the broken lines to the positions indicated by the solid lines, and the photographing is completed.

FIG. 3 shows a filter switching device. This switching device comprises a filter switching section and a film rewinding section. Introduction Filter switching section (filter driving means)
Will be described.

The filter 30 is a filter that is used during daylight to cut off strong infrared rays (hereinafter, infrared cut filter for daylight) 30a, and a weak infrared light that is used when irradiating auxiliary light when using an electronic flash device. Filter to be used (hereinafter,
Auxiliary light infrared cut filter) 30b. These filters 30a, 30b
Form a filter element. These filters are 1
You may vapor-deposit a coating material having different properties on one glass plate or plastic plate to make it integrally, or cut two different filters into a predetermined size and store them in the filter holder 32. May be.
The filter holder 32 is composed of a box portion 32c and a branch portion 32a, and is provided with an opening 32e through which a light beam passes, as shown in FIG. Also, long holes 32d and 32b are respectively formed in the branch portion 32a, and a pin 33 implanted in the camera body is slidably fitted in the long hole 32b in the longitudinal direction. Here, the filter cover 34 is provided so as to cover the four surfaces of the filter holder 32, and openings 34a through which light rays pass are formed in the upper surface and the lower surface thereof, respectively. The inner surface of the filter cover 34 is in slidable contact with the outer surface of the box portion 32c, and the pin 33
The movement of the filter holder 32 in the left-right direction is guided in cooperation with.

An aperture stop 38a is provided on the upper surface of the aperture plate 38, and the photographing light reflected by the sub-reflecting mirror 16 passes through the aperture 34a, the filter 30, and the aperture stop 38a and enters the optical block 36 of the AF device. . Branches 36a are provided on three side surfaces of the optical block 36.
Is provided, and the adjusting screw 44 penetrates the central portion thereof and is screwed into a screw hole provided in the member 13 fixed to the camera body. A compression spring 46 is inserted between the member 13 and the branch portion 36a to urge the optical block 36 upward. An optical block adjusting mechanism is configured by each of these members. Such an adjusting mechanism is provided around the optical block 36.
AF provided by turning each adjusting screw 44
The position and orientation of the optical block 36 of the device is adjusted.

Reference numeral 100 denotes a substantially U-shaped filter drive lever, which has bearing holes 100h and 600i provided at the upper and lower portions of its base and is rotatably supported around a pin 98 implanted in the camera body 12f. The filter drive lever 100 is the upper branch 100a.
And a lower branch portion 100b, a pin 102 is planted at the tip portion 100c of the upper branch portion 100a, and the tip of the pin 102 is attached to the filter holder 32.
It is slidably fitted in a long hole 32d provided in the. Therefore, when the filter driving lever 100 rotates about the shaft 98, the filter 30 held by the filter holder 32 moves left and right. Further, on the upper branch portion 100a, a projection 100e capable of contacting the pin 94 implanted in the camera body,
In addition, on the lower branch portion 100b, the pins 9 planted in the camera body 12f
6 is provided with a protrusion 100f capable of abutting, the rotation of the filter drive lever 100 is restricted by the pins 94, 96, and the left and right positioning when the filter 30 moves is also performed by these pins 94, 96. Be done.

One end 110a of the tension spring 110 is hooked on the pin 102, and the other end is hooked on a pin 112 planted in the camera body 12g.
Here, the pin 112 is provided so as to be located on the side opposite to the pin 102 with respect to the pin 98 which is the rotation center of the filter drive lever 100, and the tension spring 110 and the filter drive lever 1 are provided.
00 and 00 form a toggle mechanism. Therefore, the pin
When the pin 102 is on the left side of this, the tension spring 110 causes the filter driving lever 100 to rotate counterclockwise when the pin 102 is on the straight line extending from the pin 112 to the pin 98. Power is applied and the protrusion 100e is urged to a position where the protrusion 100e contacts the pin 94. When the pin 102 is on the right side of this, the tension spring 110 causes the filter drive lever 100 to move.
A clockwise turning force is applied to the projection 100f, and the projection 100f is urged to a position where the projection 100f contacts the pin 96.

Brush 1 on the upper branch 100a of the filter drive lever 100
06 is attached by a known method such as caulking, and sliders 106a and 106b are branched at the tip thereof. A switch substrate 108 made of glass epoxy or the like is fixed to a part of the camera body by a known method such as bonding. The conductive common terminal 108c is in a position where the slider 106b of the brush 106 can always slide on the surface, and the slider 106a can slide in contact when the protrusion 100e of the filter driving lever 100 contacts the pin 94. The signal terminal 108a is provided at the position, and the signal terminal 108b is provided at the position where the slider 106a can be slidably contacted when the protrusion 100f of the filter drive lever 100 comes into contact with the pin 96. Also, the slider 10
The tips of 6a and 106b are each divided into two in order to make electrical contact with the terminals 108a, 108b, 108c more reliable. The brush 106 and the switch substrate 108 constitute a filter position detection switch. Here, the contact between the common terminal 108c and the signal terminals 108a and 108b is referred to as turning on of the switches SW1 and SW2, respectively.

According to such a configuration, the filter drive lever 100
Rotates around pin 98 and the filter drive lever 100
When the upper protrusion 100e rotates to a position where it abuts on the pin 94,
The filter holder 32 connected to the filter drive lever 100 is occupying the left side, and the infrared cut filter for daylight.
30a coincides with the filter cover opening 34a. As a result,
Since the subject light reflected by the sub-reflecting mirror 16 and entering the opening 34a passes through the infrared cut filter 30a for daylight and reaches the optical block 36 of the AF device, only the visible light is present in the optical block 36 of the AF device. Is incident. At this time, the slider 106a and the signal terminal forming the filter position detection switch
The switch SW1 is turned on by sliding contact with 108a, and an electric signal indicating that the infrared cut filter for daylight 30a is inserted in the AF optical path is generated.

On the other hand, similarly, the protrusion 100f on the filter drive lever 100
Is in contact with the pin 96, the filter holder 32
Is occupying the right side, and the infrared cut filter for auxiliary light 30b matches the opening a. As a result, the subject light from the sub-reflecting mirror 16 passes through the auxiliary light infrared cut filter 30b to
It will be incident on the optical block 36 of the F device. Also,
The switch SW2 is turned on due to the sliding contact between the slider 106b and the signal terminal 108b, and the auxiliary light infrared cut filter 30b is turned on.
An electric signal indicating that the light beam is inserted into the F optical path is generated.

A bearing hole 114e is provided at one end of the connecting rod 114, and the pin 104 planted at the tip of the lower branch portion 100b of the filter drive lever 100 is fitted therein. At the other end, a fork 114c is formed by the projections 114a and 114b, a long hole 114d is formed, and a pin 116 is planted on a part 12j of the camera body.
Is slidably fitted in the long hole 114d. Therefore, when the connecting rod 114 swings to the left and right, the filter driving lever 100 rotates about the pin 98.

A pin 119 is planted at one end of the transmission lever 118, and the tip of the pin 119 is arranged so as to project from the forks 114c of the connecting rod 114 so as to project from the projections 114a and 114b. Further, a long hole 118b is formed on the transmission lever 118 in the vicinity of the pin 119, and the pin 120 implanted in the part 12j of the camera body is slidably fitted therein. Further, on the transmission lever 118, pin 1
A bearing hole 118f is formed on the side opposite to 19. Holes 118b and 11
Two protrusions 118c and 118d are bored in the middle of 8f, and these form a fork portion 118e of the transmission lever 118. The tip surface of one of the protrusions 118c is a flat portion 118g.

A bearing hole 124b is provided in the base portion of the support lever 124, and a pin 126 planted in a part 12d of the camera body is fitted therein. The support lever 124 is rotatably supported around the pin 126. ing. A pin 122 is planted at the tip 124a of the support lever 124 and fitted into a bearing hole 118f on the transmission lever 118. As a result, the transmission lever 118 is guided by the pin 120 and the support lever 124 to swing left and right. Due to this swinging motion, the tip of the pin 119 on the transmission lever 118 abuts on the two projections 114a and 114b of the fork portion 114c of the connecting rod 114, causing the connecting rod 114 to swing left and right, thus driving the filter. The lever 100 pivots around the pin 98.

Reference numeral 48 denotes a motor whose output shaft 48a rotates clockwise or counterclockwise. In one embodiment of the present invention, the output shaft 48a is arranged below the film cartridge chamber in the camera body. The pinion gear 50 is fixed to the output shaft 48a by a known method such as press fitting and rotates integrally. A gear 54a meshing with the pinion gear 50 is formed integrally with the gear 54b by a hollow shaft 54. Pin 5 planted in the camera body 12m
The reference numeral 2 is fitted into the hollow shaft 54 to rotatably support the gears 54a and 54b. The gear 58 that meshes with the gear 54b is integrally formed with a worm 58a having a spiral groove that is twisted in the left-hand screw direction. A shaft 56 is fixed to the gear 58 by a known method such as adhesion, and a snap ring 56a is detachably attached to the shaft 56 at the tip thereof. The base portion of the bearing plate 59 having a bearing hole 59a at the tip is fixed to the camera body by a known method. A shaft 56 extends through the bearing hole 59a to rotatably support the gear 58 and the worm 58a. Here, since the diameter of the bearing hole 59a is smaller than the outer diameter of the snap ring 56a and the worm 58a, the bearing plate 59 is sandwiched by the snap ring 56a and the worm 58a, and the worm 58a
It receives the thrust force generated by a. The worm gear 60 that meshes with the worm 58a is fixed to the shaft 62 by a known method such as press fitting.When the worm 58a rotates clockwise, the shaft 62 also rotates clockwise, and the worm 58a rotates counterclockwise. When rotated, the shaft 62 also rotates counterclockwise.

The rotation of the motor output shaft 48a is reduced by these gears 50, 54a, 54b, 56 and transmitted to the worm 58a, and further reduced by the worm gear 60 to drive the shaft 62. Referring to the rotation direction, when the output shaft 48a rotates clockwise, the worm 58a rotates clockwise, and when the output shaft 48a rotates counterclockwise, the worm 58a rotates counterclockwise. When is rotated clockwise, the shaft 62 is also rotated clockwise, and when the output shaft 48a is rotated counterclockwise, the shaft 62 is also rotated counterclockwise.

A clutch plate 66 having three protrusions is fixed to the shaft 62 by a known method, and rotates together with the shaft 62. The clutch case 64 is formed in a bottomed cylindrical body, and a shaft 62 is passed through a bearing hole (not shown) formed in the center of the bottom of the clutch case 64, whereby the clutch case 64 is rotatably supported by the shaft 62. A protrusion 64a is provided on the edge of the clutch case 64 so that the clutch case 64
The clutch plate 66 and three steel balls 68 are housed in the.
When the projection shape of the clutch plate 66 is properly determined and the shaft 62 rotates counterclockwise and the clutch plate 66 rotates in the same direction, a steel ball
When 68 is caught between the inner wall of the clutch case 64 and the clutch plate 66, the rotational power of the shaft 62 is transmitted to the clutch case 64, and when the shaft 62 and the clutch plate 66 rotate clockwise, the steel ball
68 is disengaged and the shaft 62
The power transmission to is cut off. That is, the clutch case 64, the clutch plate 66, and the steel balls 68 constitute a known one-way clutch. Hereinafter, this is referred to as a first clutch.

A part of the clutch lid 69 has a notch 6 that engages with the protrusion 64a.
9a is provided, and a bearing hole 69b through which the shaft 62 passes is bored in the center. The clutch lid 69 has a protrusion 64a and a cutout 69a.
It is rotatably supported around the shaft 62 by engagement with. The pin 70 planted on the edge of the clutch lid 69 is loosely inserted in the fork portion 118e of the transmission lever 118. The shaft 62 is also loosely inserted in the fork portion 118e. Where pin 70
The distance between the shaft 62 and the shaft 62 is determined to be longer than half the moving distance of the connecting rod 114. Further, the inner dimension of the fork portion 118e is made slightly wider than the outer dimension of the pin 70 and the shaft 62 so that the pin 70 can rotate in the fork portion 118e without any restriction, and the transmission lever Has limited 118 strokes.

Here, when the shaft 62 rotates counterclockwise, the above-mentioned first clutch is engaged, and the clutch case 64 and the clutch lid are engaged.
It transmits power to 69 and rotates them counterclockwise.
This rotation causes the pin 70 on the clutch lid 69 to move to the fork part.
By contacting the protrusions 118c and 118d of 118e and pushing the protrusion 118c to the left side or the protrusion 118d to the right side, the transmission lever 118 is swung left and right to transmit power. On the other hand, when the shaft 62 rotates clockwise, the first clutch is disengaged, the power is not transmitted to the clutch case 64 and the clutch lid 69, and the pin 70 hardly moves.
118 remains stationary. However, when the shaft 62 starts rotating in the clockwise direction and the first clutch is disengaged, some force acts to rotate the clutch case 64 and the clutch lid 69 in the clockwise direction. At this time, when the pin 70 is in contact with the protrusion 118c, the pin 70 once rotates about the shaft 62 by about 180 degrees to contact with the protrusion 118d, and the transmission lever 118 is swung to the right. Then, the tip 118g of the protrusion 118c comes into contact with the tip 118g. As a result, the rotation of the clutch case 64 and the clutch lid 69 is limited, and the first clutch is completely disengaged. When the pin 70 is in contact with the protrusion 118d, the clutch case 64 and the clutch lid 69 are rotated clockwise as they are, and the pin 70 is in contact with the tip 118g, and the first clutch is disengaged. become.

Next, the structure of the film rewinding mechanism (film driving means) will be described.

A bearing hole 61 is provided at the tip of the bearing plate 61 fixed to the camera body.
a, 61b are provided, the shaft 62 penetrates the bearing hole 61a, and the bearing plate 61
Rotatably supports the shaft 62. The gear 72 is fixed to the shaft 62 by a known method such as press fitting. One end of the rotary shaft 74 to which the gear 80 and the clutch plate 76 are fixed by a known method is fitted into the bearing hole 61b, and the rotary shaft 74 is rotatably supported by the bearing plate 61. A clutch case 75 having a gear 75a on its outer periphery is rotatably supported on a shaft 74. Similar to the first clutch, a steel ball 78 is arranged between the clutch plate 76 and the inner wall of the clutch case 75. Therefore, the clutch case 75, the clutch plate 76, and the steel ball 78 form a second clutch that is a one-way clutch similar to the above-described first clutch. The second clutch is engaged when the clutch case 75 rotates counterclockwise, and rotates the rotating shaft 74 and the gear 80 counterclockwise. When the clutch case 75 rotates clockwise, the transmission is cut off, and the rotary shaft 74 and the gear 80 remain stationary.
The gear 75a provided outside the clutch case 75 is a gear 75
Meshes with.

The gear 82 having an oval hole 82a formed in the center meshes with the gear 80. The rewind shaft 84 has an oval shaft 84a fitted in the oval hole 82a at one end thereof, and flange portions 84b, 84c at the middle portion thereof.
A fork 84d is provided at the other end. This rewinding shaft 8
Reference numeral 4 denotes a bearing (not shown) provided on the ceiling portion of the cartridge chamber of the camera body, which is slidably and rotatably held in the thrust direction. Since the oval shaft 84a is fitted in the oval hole 82a, power is transmitted from the gear 82 and the oval shaft 84a slides freely in the thrust direction.

The rewinding lever 86 is fixed to the shaft 88 at its central portion.
Rotate to the body. In addition, a pin 8 is attached to one end 86a of the rewinding lever 86.
5 is planted, and the tip of this is the flange part 84b of the rewind shaft 84.
When the rewinding lever 86 is fitted between the rewinding shafts 84c, the rewinding shaft 84 is slid vertically. Further rewind lever
A protruding portion 86b is provided at the other end of 86. Tension spring 9
One end of 1 is hooked on a pin 93 implanted in the camera body,
The other end engages with the vicinity of the protrusion 86b of the rewinding lever 86 to urge the rewinding lever 86 clockwise. The pin 89 planted in the camera body abuts the protrusion 86a, and locks the clockwise urging force of the rewind lever 86 by the spring 91. A shaft 88 having a rewinding lever 86 fixed to one end and an operation member 90 outside the camera body fixed to the other end is rotatably supported by a bearing provided in a part 12h of the camera. Operating member 90
The pressing portion 90a is provided in the. The rewinding switch (second command means) 92 that constitutes the switch SW3 is a stator 92b.
When the rewinding lever 86 rotates counterclockwise, it is pushed up by the protrusion 86b and comes into contact with the stator 92b.
have a and. Here, the rewind switch 92 is the mover 92a.
When it contacts with 92b, it turns on and outputs a rewind signal.

The well-known cartridge 29 has an upper end portion 29a of the film winding shaft at the end portion thereof, and when the rewinding shaft 84 slides downward, its fork 84d meshes. Also in this embodiment, as in a general camera, the cartridge is stored in the cartridge chamber provided in the camera body, and the tip of the film 28 wound on the winding shaft in the cartridge traverses the photographing screen. And is wound around a winding shaft (not shown).

 Next, the operation of this embodiment will be described.

First, the filter switching device will be described. FIGS. 4 (a), (b) and (c) illustrate the operation of the driving force transmission section constituted by the filter / filter drive lever 100, the connecting rod 114, the transmission lever 118, the pin 70 and the like.

FIG. 3 shows a state in which the infrared cut filter 30a for daylight used during daylight is inserted in the AF optical path, and the projection 100e of the filter drive lever 100 contacts the pin 94 by the spring force of the toggle mechanism, As for the filter position detection switch, the switch SW1 turns on and the infrared cut filter 30a
It generates an electric signal indicating that it is inserted in the optical path. FIG. 4 (a) shows the state of the driving force transmission section in this state.

(B) Switching from the infrared cut filter 30a for daylight to the infrared cut filter 30b for auxiliary light Here, the filter switching signal becomes L level by the electronic circuit (Fig. 6) in the camera, and the infrared cut filter for auxiliary light. When the filter 30b is required, the motor 48 starts rotating counterclockwise. This counterclockwise turning force is
Drive shaft 62 counterclockwise via a. Therefore,
The first clutch is engaged and the clutch lid 69
Rotate counterclockwise around. As a result, the pin 70 on the clutch lid 69 rotates counterclockwise around the shaft 62 and comes into contact with the projection 118d of the fork portion 118e of the transmission lever 118, causing the transmission lever 118 to swing rightward. Therefore, the pin 119 on the transmission lever 118, which has a predetermined gap from the fork portion 114c of the connecting rod 114, comes into contact with the projection 114a of the fork portion 114c, and drives the connecting rod 114 to swing rightward. To do. Therefore, the filter drive lever 100, which is connected by the connecting rod 114 and the pin 104, is driven clockwise around the pin 98 against the force of the tension spring 110 of the toggle mechanism. When the filter drive lever 100 is driven in the clockwise direction, the filter holder 32 connected by the pin 102 starts to move to the right, and the infrared cut filter for daylight 30a begins to retract from the optical path of the AF device. The infrared cut filter 30b for auxiliary light is inserted and moved into the optical path.
At this time, the slider 106a is separated from the signal terminal 108a, and the switch SW
1 is turned off. At this time, the switch SW2 is also off,
Both switches will output an electrical signal indicating that the filter is moving.

When the motor 48 further rotates in the counterclockwise direction and the clockwise rotation of the filter drive lever 100 progresses, and the filter drive lever 100 reaches a position beyond the neutral point of the toggle mechanism, the filter drive lever 100 becomes the spring of the spring 110. The force automatically rotates clockwise without depending on the driving force of the motor 48. At this time, since a predetermined gap is provided in advance between the fork portion 114c of the connecting rod 114 and the pin 119, the driving force of the spring 110 and the driving force of the motor 48 do not interfere with each other.

Then, as shown in FIG. 4 (b), the protrusion 100f is pin 96.
And the clockwise rotation of the filter drive lever 100 is stopped. As a result, the movement of the filter 30 connected to the filter drive lever 100 to the right is stopped, and the infrared cut filter 30b for auxiliary light is placed in the AF optical path.
Is inserted. In addition, the slider 106a and the signal terminal 108b are in sliding contact with each other, the switch SW2 is turned on, and the infrared cut filter 30b is turned on.
An electric signal is generated to indicate insertion into the AF optical path. In response to this signal, the electronic circuit in the camera shortens the power supply terminal of the motor 48 to apply a brake and
Turn off the power to 48 and stop it. With the above, switching from the infrared cut filter for daylight 30a to the infrared cut filter for auxiliary light 30b is completed.

(B) Switching from the infrared cut filter 30b for auxiliary light to the infrared cut filter 30a for daylight Next, when an H level filter switching signal is generated and insertion of the infrared cut filter 30a for daylight is requested. As in the previous case, the motor 48 rotates counterclockwise and the shaft 62 also rotates counterclockwise. The first clutch is engaged,
The pin 70 rotates counterclockwise about the shaft 62 and contacts the protrusion 118c of the fork portion 118e. As a result, the transmission lever
118 is pushed by the pin 70 and swings to the left. This motion is transmitted to the connecting rod 114, and the filter driving lever 1
Turn 00 counterclockwise. Along with this, the filter 30 starts moving to the left.

When the filter drive lever 100 rotates counterclockwise and passes the neutral point of the toggle mechanism, the tension spring 110 automatically urges the filter drive lever 100 counterclockwise so that the protrusion 100e abuts the pin 94. Filter drive lever
The rotation of 100 stops. As a result, the movement of the filter 30 to the left is also stopped, and the infrared cut filter 30a for daylight is inserted into the optical path of the AF device. At this time, the slider 106a and the signal terminal 108a that constitute the filter position detection switch
And the switch SW1 are turned on by sliding contact with each other, and an electric signal indicating that the daylight infrared cut filter 30a is inserted into the optical path of the AF device is generated. In response to this signal, the motor 48 is stopped in the same manner as described above, which causes the auxiliary light infrared cut filter 30b to the daylight infrared cut filter 3b.
The filter switching to 0a is completed. With these operations, the state of the driving force transmission device shown in FIG. 4 is (b).
To (a) again.

As described above, the filter switching operation in this embodiment is performed only by the counterclockwise rotation of the motor 48, and the shaft 62 rotates only in the counterclockwise direction during this operation. The driving force of the motor 48 is transmitted to the filter driving lever 100 via the first clutch and also to the gear 72 by the shaft 62, so that the gear 72 rotates counterclockwise. Therefore, the gear 75a meshing with the gear 72, that is, the clutch case 75 rotates clockwise. However, since the second clutch is not engaged in the clockwise rotation of the clutch case 75, the gears 80 and 82 and the rewind shaft 84 are not driven.

As a result, only the load of the filter switching mechanism acts on the motor 48, and the power consumption is minimized, and the efficiency is high.
Further, even if the fork 84d is engaged with the winding shaft 29a of the cartridge by operating the rewinding operation member 90, the film is not wound because the rewinding shaft 84 is not rotating. That is, the second clutch also functions as a safety device at the time of erroneous operation. Further, the transmission lever 118 includes a shaft 119 and a connecting rod 114.
The filter driving lever 100 is driven via the filter driving lever 100. If the filter driving lever 100 is driven until it exceeds the neutral point of the toggle mechanism described above, then the filter 30 is driven by the spring force of the spring 110. Here, since the neutral point is set substantially at the center of the filter movement stroke, the stroke of the transmission lever 118 may be only half of the filter stroke.

(C) Film Rewinding Operation Next, the film rewinding operation will be described.

When the exposure of all the frames is completed and the user pushes down the pressing portion 90a of the operation member 90, the shaft 88 rotates counterclockwise, and the rewinding lever 86 fixed to this also rotates the shaft 88 around the shaft 88. It turns counterclockwise against the force of 91. At this time, the rewind lever
The pin 85 planted at the tip 86a of the 86 moves downward and moves downward through the flange portions 84b and 84c. When the fork 84d of the rewinding shaft 84 is connected to the cartridge winding shaft 29a, the rewinding shaft 84 causes the winding shaft 2
9a can be driven. On the other hand, when the rewind lever 86 rotates counterclockwise, the protrusion 86b pushes up the mover 92a, whereby the stator 92b and the mover 92a come into contact with each other,
Rewind switch SW3 turns on and a rewind signal is generated.
Upon receiving this signal, the electronic circuit inside the camera supplies electric power to rotate the motor 48 in the clockwise direction.

The output shaft 48 of the motor 48 rotates clockwise, and 50, 54a, 54
The worm 58a rotates clockwise through the b and 58, and the foam gear 60 rotates clockwise. Therefore, the shaft 62 drives clockwise, and the gear 72 at the upper end also rotates clockwise,
The gear 75a is driven counterclockwise. As a result, the clutch case 75 rotates counterclockwise, the second clutch moves to the engaged state, and the gear 80 connected to the second clutch rotates counterclockwise. Counterclockwise rotation of gear 80 causes the gear
82 rotates clockwise, and the rewind shaft 84 rotates clockwise. Since the fork 84d of the rewinding shaft 84 and the winding shaft 29a are connected, the winding shaft 29a rotates clockwise and the film 28
Is rewound into the Patrone.

After the rewinding is completed, the user presses the pressing portion 90 of the rewinding operation member 90.
When the pressing of a is stopped, the rewinding lever 86 is rotated clockwise by the spring 91, and the rewinding shaft 84 is pushed up and the winding shaft 29 is rotated.
The connection between a and fork 84d is released. At this time, the tip 86
Since b moves downward and separates from the mover 92a, the rewind switch SW3 is turned off and a rewind stop signal is generated. As a result, the clockwise rotation of the motor 48 stops and the rewinding operation ends. Incidentally, a rewinding completion switch SW4 (not shown) which is turned on when the film 28 is completely rewound on the cartridge 29.
It is also possible to stop the rewinding by the signal of.

In the rewinding operation as described above, since the shaft 62 rotates clockwise, the second clutch is connected to transmit the power for rewinding the film. However, the clockwise rotation of the shaft 62 causes the first clutch to rotate. The clutch is disengaged, and the pin 70 abuts the flat end portion 118g of the projection 118c protruding from the transmission lever, as shown in FIG. 4 (c). Is not transmitted at all. As a result, only the power for rewinding acts on the motor 48 as a load, and rewinding is performed with less power consumption as in the filter switching operation.

 Next, the electric control system will be described.

FIG. 5 is an electric circuit diagram for operating the mechanism of FIG. As a result of decoding by the gates G1 to G20 based on the filter signal F and information of various switches, the bridge circuit composed of the transistors Q1 to Q4 is operated to control the clockwise or counterclockwise rotation of the motor 48. The output level of the filter signal F is determined by the circuit shown in FIG.
In the case of this circuit, the auxiliary light infrared cut filter 30b described in FIG. 3 is requested at the H level, and conversely, when the filter signal F is at the L level, the daylight infrared cut filter 30a is inserted. Will be a signal requesting.

The filter position detection switches SW1 and SW2 are turned on when the infrared cut filters 30a and 30b are respectively inserted, as described in FIG. The rewinding switch SW3 is turned on by the rewinding operation, and the rewinding completion switch SW4 is turned on when the film rewinding is completed, although not shown in FIG.

The gates G1 to G16 form a decoder based on the above signals, and the output of the gate G6 is the motor 48.
In order to rotate clockwise, the transistors Q1 and Q4 are turned on via the gates G18 and G20, and the gate G16 acts so as to output a pulse for a certain time from the Wanshi Yacht multivibrator MB, and then through the gates G19 and G20. Transistor Q2,
Turn on Q4 and brake the motor 48. Also the gate
G15 turns on transistors Q2 and Q3 via gates G17 and G19 to rotate motor 48 counterclockwise. The above constitutes the control means.

 This electric circuit operates as follows.

First, as shown in FIG. 3, it is assumed that only the filter position detection switch SW1 is turned on, that is, the filter 30a is inserted. Other switch SW
2, SW3 is off, and the state of switch SW4 does not matter.

If the filter signal F is at the H level, that is, if the infrared cut filter 30b for auxiliary light is requested, the gate G11
Since both of the two inputs become H level, the output of the gate G13 becomes H level, and the two inputs of the gate G15 become both H level, the output of the gate G17 becomes L and the output of the gate G19 becomes H, and the transistors Q3 and Q2 are turned on. As a result, the motor 48 is rotated counterclockwise, and the auxiliary light infrared cut filter 30b is inserted and driven in the optical path through the power transmission system path as described above.

When the auxiliary light infrared cut filter 30b is inserted and the switch SW2 is turned on, only the output of the gate G8 is inverted to the H level this time. Then, the gates G12, G14, G16 are also H
The level is output and the One-Sailboat Multivibrator MB operates to output the H level pulse for a certain period of time. This output turns on the transistors Q2 and Q4 for a certain period of time via the gates G19 and G20, and causes the motor 48 to suddenly stop. At this time, when setting the pulse width of the One Sailboat Multivibrator MB,
It is set so that the motor 48 is surely stopped within that time.

Similarly, when the filter signal F is at L level, that is, when the insertion of the infrared cut filter 30a for daylight is required, the output of the gate G10 becomes H until the switch SW1 is turned on. Rotate the motor 48 counterclockwise. Infrared cut filter for daylight 30
When a is inserted and the switch SW1 is turned on, the output of the gate G7 becomes H and the motor 48 is braked to complete the inserting operation.

When the rewinding operation is performed, the operation is performed as follows.

When the rewinding switch SW3 is turned on by operating the rewinding operation member 90 shown in FIG. 3, both gates G14 and G15 have one input at the L level, so that the output becomes L, which is related to the above-described filter insertion operation. The counterclockwise rotation of the motor 48 and the braking operation are interrupted. That is, rewinding has priority over filter switching. On the other hand, at this time, the rewinding completion switch SW4
Is off, the output of the gate G6 becomes H level, the transistors Q1 and Q4 are turned on through the gates G18 and G20, and the motor 48 is rotated clockwise.

In this way, the film rewinding proceeds, and when the rewinding is completed, the switch SW4 is turned on. As a result, only the output of the gate G9 is inverted to the H level, the one-yacht multivibrator MB is operated via the gate G16, the motor 48 is braked in the same manner as described above, and the rewinding operation is completed.

Note that the rewinding can be ended by manually releasing the rewinding switch SW4, but in this case, the motor 48 is not braked after a short time which is not a problem in practical use. Stop.

FIG. 6 shows an electric circuit B for generating the filter signal F shown in FIG.

This circuit B has two circuit blocks B1 and B2, which are respectively responsible for brightness detection and infrared projection. The brightness detection block B1 converts the output from the light receiving element D5, which changes the photocurrent according to the brightness of the object, by the amplifier A1, the bias E1, and the logarithmic compression diode D6. The output of the amplifier A1 is used by the well-known control circuit P1 for exposure control, display control, etc., while it is compared with the voltage source E2 by the comparator C1. Here, the output of the comparator C1 is transmitted to the gate G22 as the luminance signal F1, but this output becomes H level when the subject has low luminance, and the filter signal F also becomes H level. As a result, as described in FIG. 3, it is required to insert the auxiliary light infrared cut filter 30b. Further, when the subject brightness is equal to or higher than the predetermined level, the output of the comparator C1 becomes L level and is supplied to the gate G22, so that the filter signal F also becomes L level and the infrared cut filter 30 for daylight.
Insertion of a is required.

Further, the infrared projection block B2 forms a filter signal F2 for a gap in which the auxiliary light source illuminates when the subject is dark. The circuit P2 is a circuit for judging the necessity of projection of the auxiliary light source, and sets the output to the H level during projection regardless of manual or automatic. This H level signal is resistor R9
Then, the transistor Q5 is turned on via and the projection light source D7 is caused to emit light. On the other hand, this H level signal is transmitted to the gate G22 as the output F2 of the circuit block B2. Therefore, at the time of projection of the auxiliary light source, the filter signal F is set to the H level and the insertion of the auxiliary light infrared cut filter 30b is required. The above constitutes the first command means.

In this embodiment, the subject brightness is detected by the output of the light receiving element D5 originally used for exposure control, but the subject brightness may be detected by the accumulation time of the focus detection element 40. At this time, the circuit block B1 is composed of the focus detection element 40, its interface circuit, and counters substituted by a microcomputer, but the details are omitted.

Next, modified examples of the respective parts described above will be described. The same parts as those in FIGS. 2 to 4 are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 7 shows a transmission lever 11 by a solenoid plunger.
It is designed to drive 8.

The bistable solenoid plunger 128 changes the polarity of the electric power supplied to the terminals so that its output shaft 128a drives left and right, and holds the respective positions even after the electric power supply is cut off. A pin 128c is embedded in the tip 128b of the output shaft 128a. The tip of the pin 128c is slidably fitted in a long hole 124c provided at the center of the support lever 124. The support lever 124 is connected to the transmission lever 118 by a pin 122. When the output shaft 128a of the solenoid plunger 128 is driven in the left-right direction, the support lever 124 rotates left and right around the bearing portion 124b, and the transmission lever 118 swings left and right through the pin 122. The other parts have the same configuration as that of the first embodiment described above.

Next, the operation of the modification shown in FIG. 7 will be described.

When an H level filter signal is output to request the auxiliary light infrared cut filter 30b, pulsed electric power having the first polarity is supplied between the terminals of the solenoid plunger 128, and the output shaft 128a is , Moving from left to right in FIG. Then, the support lever 124 pivots clockwise to swing the transmission lever 118 from left to right. This movement causes the filter drive lever 100 to rotate clockwise through the connecting rod 114, and the filter 30 connected thereto moves from left to right as in the first embodiment, so that the filter cutting The operation is completed. At this time, the filter position detection switch is activated to generate an electric signal indicating completion of filter switching. This signal also indicates that the infrared cut filter 30b for auxiliary light is inserted.

Next, L that requires the infrared cut filter 30a for daylight
When the level filter signal is output, pulsed electric power having a polarity opposite to that in the above case is supplied to the solenoid plunger 128, and the output shaft 128a moves from right to left in FIG. 7 to move the filter drive lever. Rotate 100 counterclockwise to move filter 30 from right to left. As a result, the infrared cut filter for daylight 30a is inserted in the optical path, and the filter position detection switch generates an electric signal indicating that the infrared cut filter for daylight 30a is inserted in the AF optical path.

Here, the point of action 1 of the driving force of the solenoid plunger 128
28c is the rotation center 124b of the support lever 124 and the transmission lever 11
Since it is provided in the vicinity of the central portion of the distance from the pin 122 connecting the 8 to the support lever 124, the movement of the output shaft 128a is enlarged and transmitted to the transmission lever 118.

By the way, since the solenoid plunger 128 is operated by the magnetic repulsion force and the magnetic attraction force generated by the solenoid coil and the permanent magnet, the driving force for operating the output shaft is remarkably reduced when the operation stroke is increased. Or if you try to drive the output shaft with a constant force,
Remarkably large electric power is required. However, the filter driving lever 100 is driven by the force of the spring 110 after being driven to the neutral point of the toggle mechanism by the solenoid plunger 128, as in the first embodiment described above. Working stroke is filter 30
The filter 30 can be switched even if it is smaller than the movement amount of the filter. Therefore, low power consumption and solenoid plunger
Can drive 128.

FIG. 8 shows a modified example of the electric control system in which the above-mentioned filter insertion operation, autofocus operation and auxiliary light lighting operation are arithmetically controlled by a microprocessor. The same parts as those in FIGS. 2 to 6 are designated by the same reference numerals in the following description.

Signals from the filter position detection switches SW1 and SW2 are input to the microprocessor MPU, and the filter signal F from the filter signal generation circuit B is also input. Here, the generating circuit B is a circuit in which the circuit blocks B1 and B2 in FIG. 6 are combined and the auxiliary light source D7 and its driver stage are removed. Due to the above connection relationship, the microprocessor MPU can operate the filter signal F and the switch S
Various control calculations are performed by judging the filter position detection signal by the combination of W1 and SW2. The motor driver DR1 is connected to the output of the microprocessor MPU. The driver DR1 rotates the motor 48 in the forward and reverse directions (clockwise rotation and counterclockwise rotation, respectively) and brakes according to a command from the microprocessor MPU. Further, the interface circuit INT is located between the CCD 40 for autofocus and the microprocessor MPU, transmits the focus state of the subject detected by the CCD 40 to the microprocessor MPU, and controls the gain of the CCD 40 by the output of the microprocessor MPU. To do. The driver DR2 is also connected to the output of the microprocessor MPU. This driver D
R2 is for driving the auxiliary light source D7 and includes the transistor D5 and the like in FIG. 6, and turns on the auxiliary light source at an appropriate timing according to a command from the microprocessor MPU. Incidentally, in FIG. 8, those related to photometry, shutter control, display control, film winding, etc. necessary for this type of camera are omitted.

The microprocessor microprocessor MPU having the above-described configuration performs processing in the processing procedure shown in FIG.

FIG. 9 shows a routine for controlling the operation of the motor 48 by the filter signal F and simultaneously controlling the CCD and the auxiliary light source D7 shown in FIG. As described with reference to FIG. 3, the motor 48 also rewinds the film by rotating in the clockwise direction, but this is excluded from this routine. Of course, film rewinding has priority over filter insertion.
The operation is performed as follows. First, when entering the filter insertion routine, the auxiliary light is turned off in step S1, and the accumulation of CCD 40 is stopped and initialized in step S2. This is because it is meaningless if the subject is illuminated during the filter insertion operation, especially while the filter is moving, and similarly, the detection by the CCD 40 is also unnecessary. Next, the filter signal F is read to determine which kind of filter should be inserted in step S3. Here, if the infrared cut filter 30a for daylight is required, in the next step S4, it is determined whether or not the switch SW2 for detecting the insertion of the infrared cut filter 30a is turned on. If the switch SW2 is turned on, there is no need to drive the motor 48 because it already matches the filter signal, and the process proceeds to the next step S5, the auxiliary light source is turned on if necessary, and the irradiation is performed in step S6. The accumulation of the CCD 40 is started to detect the focused state of the subject, and this routine is finished.

If the switch SW2 is off in step S4, the motor 48 is rotated in reverse (counterclockwise rotation) in step S7.
Then, the infrared cut filter 30a for daylight is inserted. Then switch again in step S8.
It is detected whether or not SW2 is turned on, and when it is detected that it is turned on, the motor 48 is braked and stopped in step S12, and the process is terminated after passing through steps S5 and S6 described above. On the other hand, if the auxiliary light infrared cut filter 30b is requested in step S3, the ON state of the switch SW1 is determined in step S9, and steps S10, S11, and S12 are performed in the same manner as in the case of the switch SW2. To do.

If the program as described above is prepared, it is possible to save power without the need to turn on unnecessary auxiliary light, CCD storage, etc. during the filter insertion operation. Even if a release signal is issued during the processing of this routine, the filter insertion operation is in progress or the CCD40
It is preferable that the release operation, that is, the operation of giving exposure is prohibited during this period and is performed after all steps have been completed, because the accumulation of the image is stopped and the guarantee that it is in the proper focus state cannot be obtained. . Of course, in the case of the mode in which the release operation is prioritized, on the contrary, the routine may be quickly exited and the release sequence may be started.

The electric circuit corresponding to the modified example of FIG. 7 is a motor driver unit including the transistors Q1 to Q4 in FIG.
Details can be omitted because it can be easily achieved by a method of slightly simplifying the motor driver DR1 in FIG.

Still another modification of the filter switching mechanism and electric control system is shown in Figs. In this embodiment, the wavelength of the subject light is detected and an optimum filter is inserted by a bimorphactor.

FIG. 10 shows an example of the electric circuit. The amplifier A2 and its peripheral elements are circuits that detect the light quantity below a certain wavelength in the filter FT1, and the amplifier A3 and peripheral elements are the filter FT2.
Is a circuit that detects the amount of light above a certain wavelength. Amplifier
A4 and its peripherals constitute an operational amplifier,
The output changes depending on the output ratio of 2, A3. That is,
If the output of amplifier A2 is high, the output is high,
If the output of A3 is large, the output becomes low, and by comparing the output with the voltage E3 by the comparator C2, it is determined which wavelength band has a large amount of light at a certain wavelength. here,
The light receiving elements D8 and D10 can be provided in the vicinity of the light receiving element used for normal exposure control, or can be provided outside the camera so that light incident on a subject can be detected. The comparator C2 output according to the wavelength range of the subject light turns on the transistor Q6 via the gate G23 and the latch circuit A5 only when the half-press switch SW5 that is turned on at the first stage of the release button is turned on. It is turned off and the drive of the bimorph actuator BM is controlled. In the case of the figure, it operates so as to drive the bimorph actuator BM when the amount of light of a certain wavelength or more is large.

FIG. 11 shows a filter driving structure using the bimorph actuator BM.

One end of the bimorph actuator BM is fixed, and the filter holder H is fixed to the other end. Two infrared cut filters 30a and 30b for daylight and auxiliary light are installed in the filter holder H. When the bimorph actuator BM is at the broken line position when no power is supplied, the infrared cut filter 30a for daylight is opened 38a. When the bimorph actuator BM is energized, the element itself bends as shown in the drawing, and the auxiliary light infrared cut filter 30b faces the opening 38a.

By combining FIG. 10 and FIG. 11, the same effect as that described in FIG. 3 and the like can be obtained. That is, when it is determined that there is a large amount of light of a certain wavelength or more, for example, when the auxiliary light is illuminated, the bimorph actuator BM is operated to insert the auxiliary light infrared cut filter 30b, and in the opposite case, it is left as it is. In this case, the infrared cut filter is switched.

If the bimorph actuator BM is used as described above, the filter insertion switching time can be extremely short, so that the timing of the shutter lens becomes appropriate. In the circuit example of FIG. 10, the bimorph actuator BM can be driven only when the half-push switch SW5 is turned on, but the invention is not limited to this, and it can be changed in any way depending on how the camera operates. is there. The latch circuit A5 is a bimorph actuator when the subject light changes drastically.
Since it is expected that the number of BM operations will be unnecessarily increased, in order to avoid this, it is possible to prevent the bimorph actuator BM from being driven only at regular time intervals with a timer circuit, or during the exposure period after the shutter release. The drive is stopped.

 Next, the effect of the embodiment will be described.

(1) Generally, a camera body of 35 mm size is a combination of a patrone chamber for a patrone, a spool chamber for film winding, a rear body consisting of a screen between them, and a front body consisting of a lens mount, a mirror box, etc. Is configured. The optical block of the AF device, the electronic circuit of the AF device, the light-receiving element for dimming used in the electronic flash, and the like are generally suspended below the floor of the mirror box of the front body. In this embodiment, two infrared cut filters are used, and these are switched by sliding them. Therefore, it is only necessary to use a part of the space under the floor of the mirror box. By making it common with the surface, the distance between the filter and the entrance surface of the AF optical block can be increased, and the space in this part can be effectively used. As a result, there is an effect that a large vertical adjustment allowance can be taken for the AF optical block.

(2) Since the filter switching motor or solenoid plunger is placed under the floor of the patrone room away from the AF electronic circuit, there is no risk of noise in the AF electronic circuit, and reliable focus detection with no malfunction occurs. You can do it.

(3) Since the filter position detection switch is incorporated,
For example, even if the camera is turned off and the operation stops during the filter switching operation, it can be determined by the position detection switch that the switching has not been completed, and when the power is supplied, the previous operation can be continued immediately. The effect is that the sequence will be simple and reliable.

(4) Since the filter positioning mechanism including the toggle mechanism and the pin is incorporated, the filter can be reliably positioned at the time of switching, and the margin can be reduced. Therefore, there is an effect that the filter can be downsized. Also, since the above-mentioned toggle mechanism is inserted in the filter drive transmission part, the stroke of the filter drive system is only half of the actual filter stroke, and the entire mechanism can be downsized, which contributes to downsizing of the camera. To do. Further, even if an external shock is applied, for example, when photographing in a swaying vehicle, the position of the filter can be reliably held by the spring force of the toggle mechanism, so that focus detection can be reliably performed.

(5) Although the camera body is composed of a front body and a rear body, since the optical block of the AF device is incorporated in the front body, it is advantageous to incorporate the filter in the front body. Here, in this embodiment, the filter driving motor or the solenoid plunger is arranged under the floor of the cartridge chamber, that is, in the rear body in consideration of the assemblability. Therefore, when the front and rear bodies are combined, the filter is connected to the motor or the solenoid plunger. In the present embodiment, the connecting rod 114 connected to the above-mentioned toggle mechanism and the transmission lever 118 connected to the source driving part such as a motor are connected between the fork part 114C and the pin 119 to perform the filter switching operation. In the latter half of the above, each member is driven by the toggle mechanism, so the fork 114C that is the connecting part
A relatively large gap between the pin and the pin 119 does not affect the operation. Therefore, a machining error between the front and rear bodies can be absorbed by the gap in this portion. Therefore, there is an effect that the camera body can be assembled in the conventional manner even when the respective members of the mechanism are incorporated in the front and rear bodies separately.

(6) As described above, the filter 30 has the toggle spring 110.
Since it is driven to the final position by, there is also an effect that dust on the filter 30 is removed by a shock at the time of stop.

(7) Since the filter switching motor is also used as the film rewinding motor and the film winding motor is installed separately,
The filters can be switched even during the film winding operation and the charging operation, and the frame speed can be increased during continuous shooting without using a dedicated motor for switching the filters. Since it is a dual-purpose motor, it can be used effectively in terms of cost and space as compared with the case of using a dedicated motor.

(8) With the two clutches, the first and second clutches, only the drive section operates when switching the filter, and only the rewinding mechanism operates when rewinding, so there is little loss of driving force due to friction or the like.
This has the effect of extending the battery life.

(9) As in the modified example, when a filter that slides left and right is driven by a solenoid plunger that moves left and right,
The power transmission unit can be efficiently driven without changing the direction, and by additionally using the stroke expansion mechanism, there is an effect that the power consumption at the time of switching the filter is small and the battery life can be extended.

The present invention can be applied to the case where the filter switching and the film winding are performed by the same motor.

Further, in the embodiment, two or more kinds of filter elements are switched and used, but the present invention may be one in which one kind of filter element is simply put in and taken out.

G. Effect of the Invention According to the present invention, since the displacement of the filter means and the rewinding of the film are performed by a common motor, it is not necessary to separately provide a motor for driving the filter means, and the number of camera parts can be reduced. . Further, since the filter means is moved into and out of the optical path only by rotating the motor in one direction (forward rotation), the switching operation of the filter means is simplified.

Further, the filter means is provided between the mirror in the mirror box and the focus detection means arranged below the mirror box, and the motor for displacing the filter means and film feeding is provided below the cartridge chamber. Since the distance between the filter means and the motor in the vertical direction of the camera is minimized, the distance between the filter means and the motor in the vertical direction of the camera can be minimized. Connection mechanism with
As a result, the structure of the drive control means can be simplified and the number of parts can be further reduced, which contributes to cost reduction and downsizing of the camera.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment using the present invention, and FIGS.
FIG. 6 shows an embodiment, FIG. 2 is a longitudinal sectional view of a camera to which the present invention is applied, FIG. 3 is an overall perspective view showing a filter driving mechanism and a film driving mechanism, and FIG. 4 (a). ~ (C)
FIG. 5 is a diagram showing the movement of the main part of the power transmission unit, FIG. 5 is a circuit diagram for performing motor drive control, and FIG. 6 is a circuit diagram for generating a filter signal. 7 to 11 each show a modified example, FIG. 7 is a plan view of the power transmission portion, FIG. 8 is a circuit diagram of motor drive control, FIG. 9 is a flowchart according to the circuit diagram of FIG. FIG. 10 is a circuit diagram for driving the bimorph actuator, and FIG. 11 is a plan view of the drive section. 12 (a) and 12 (b) are a sectional view and a perspective view of a conventional filter switching device. 201: focus detection means 202: filter element 203: motor 204: filter drive element 205: first command means 206: film drive means 207: second command means 208: control means 209: film

Claims (4)

(57) [Claims] 1. A focus which is arranged below a mirror box for accommodating a mirror and which detects a focus state of the photographing lens with respect to the subject on the basis of subject light which passes through the photographing lens and is incident through the mirror. In a camera provided with a detection means, a position which is arranged between the mirror and the focus detection means, where the subject light enters the optical path leading to the focus detection means, and a position retracted from the optical path. And a filter means for selecting incident light to the focus detection means at the entrance position, a feeding means for feeding the film loaded in the camera, and a feeding means arranged below the cartridge chamber. A forward-reverse rotation motor, the filter means is caused to perform the displacement operation in accordance with the forward rotation of the motor, and the feeding operation is performed to the feeding means in response to the reverse rotation of the motor. Camera characterized by comprising a performed occupy drive control means. 2. The camera according to claim 1, wherein the drive control means controls the motor in response to a displacement command signal for displacing the filter means. 3. The drive control means, in response to a displacement command signal for displacing the filter means, causes the motor to rotate in the forward direction, and in response to a feed command signal for operating the film feeding means. 2. The camera according to claim 1, wherein the motor is caused to reversely rotate, and the control based on the feed command signal is preferentially performed over the control based on the displacement command signal. 4. The camera according to claim 1, wherein the drive control means controls the motor based on the position of the filter means.