JPH0328421Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides an exposure mode display device for a camera, more specifically, a camera in which one of a plurality of exposure modes can be selected by switching an exposure mode selector switch. The present invention relates to an exposure mode display device that displays exposure mode selection switching positions.

Conventionally, some single-lens reflex cameras with this type of exposure mode display device have been able to select an exposure mode that prioritizes the shutter by attaching a motor drive device to the camera body. In the case of a camera, even if the motor drive device is not attached to the camera body,
Since the exposure mode display allows the user to select an exposure mode that gives priority to shutter, there is a problem in that the user may inadvertently select the wrong exposure mode.

In view of the above-mentioned problems, the purpose of the present invention is to display the selection switching position of a plurality of exposure modes using a liquid crystal display member, and to make it possible to attach the motor drive device to the camera body when the motor drive device is not attached to the camera body. To provide an exposure mode display device for a camera in which exposure modes such as shutter priority, program shutter, etc. that can only be selected by the camera are not displayed.

Hereinafter, the present invention will be explained based on the illustrated embodiments.

FIG. 1 is a perspective view of a single-lens reflex camera having an exposure mode display device according to the present invention, with a photographic lens barrel 2 removed from a camera body 1. On the top surface of the camera body 1 of this single-lens reflex camera, there are a film winding lever 3, a shutter release button 4, a film (ASA) sensitivity setting dial 5, an exposure mode switching lever 6, a film rewinding knob 7, etc. A shoe 8 for attaching a strobe light is provided at the top of the viewfinder section. On the upper surface of the camera body 1, a liquid crystal display member 9 for displaying the exposure mode is disposed at a position indicated by the exposure mode switching lever 6.
shows the switching positions of program shutter (P), shutter priority (S), aperture priority (A), and manual (M) exposure modes, as well as the switching positions of power off (OFF) and self-timer (SELF TIMER). The indicators 9a to 9f for instruction and the names of their respective modes are displayed on a liquid crystal display. The indicators 9a to 9f and their mode names are all displayed when a motor drive device, which will be described later, is attached to the camera body 1. When the motor drive device is not attached, the indicators 9a to 9f are displayed. ~9f and among these mode names, indicators 9a,
9b and its mode names "P" and "S" are not displayed in order to prevent incorrect mode selection.

Body mount ring 1 at the center of the front of the camera body 1
A shutter dial 11 is arranged on the outer periphery of 0. In this body mount ring 10, the camera body 1 is adapted to mount a photographing lens barrel 2, and an engaging pawl 12 formed on the inside of the body mount ring 10 and a rear end of the lens barrel 2 are attached to the camera body 1. The body mount ring 10 and an engaging pawl 15 provided on the outside of the rear protruding portion of the lens mount ring 13 facing the camera lens 13 so as not to obstruct the photographic lens 14 are connected to each other in a bayonet manner.

The engagement claw 15 is provided at the rear end of the lens barrel 2.
A partially arcuate hole 16 is formed on the inner side, and an aperture step number setting member 18 that is integrated with an aperture ring 17 disposed on the outer periphery of the lens barrel 2 protrudes from the arcuate hole 16 . This aperture stage number setting member 1
The distal end portion of 8 is adapted to engage with an aperture information interlocking member 19 disposed inside the body mount ring 10 when the lens barrel 2 is mounted on the camera body 1. An arcuate hole 20 is formed on the opposite side of the arcuate hole 16 with the photographing lens 14 in between, and the aperture blades provided in the lens barrel 2 are opened and closed from the arcuate hole 20. A narrowing member 21 protrudes. Further, below the arcuate hole 20, an open signal pin 22 is provided which is positioned according to the open F value specific to the photographing lens barrel 2. The tip of the diaphragm member 21 and the tip of the opening signal pin 22 are placed inside the body mount ring 10 when the lens barrel 2 is mounted on the camera body 1, and the diaphragm drive member 79 (See FIGS. 6 and 7) and are adapted to engage with open F-number transmission members (not shown), respectively. The photographing lens 14 is configured to move back and forth along the optical axis O by rotation of a distance ring 23 disposed on the outer periphery of the lens barrel 2.

A photometric light receiving element 25 for exposure control and display is disposed on the bottom surface of the mirror box 24 in the camera body 1 of the single-lens reflex camera, with the light receiving surface facing upward at the rear. For this reason,
By attaching the photographing lens barrel 2 to the camera body 1, as shown in FIG. The light passes through the semi-transparent portion 26a of the mirror 26, is reflected by the auxiliary mirror 27 provided on the back surface of the movable reflecting mirror 26, and is received by the light receiving element 25. The remaining object light reflected by the movable reflection mirror 26 is guided as observation light to a pentaprism 29 through a focusing screen 28, and then enters the photographer's eye via an eyepiece 30. Photometry of the subject light of the light receiving element 25 is started when the shutter release is performed. The photometric output is then used for exposure control (including aperture control) and display. In the aperture priority mode or manual mode, when the shutter is released, the movable reflection mirror 26 is flipped up to the position 26A shown by the two-dot chain line, opening the photographing optical path, and the shutter front curtain 31 starts running. Therefore, the light reflected from the front surface of the front curtain 31 and the photosensitive surface of the film 32 exposed by the running of the front curtain is received by the light receiving element 25, and the amount of light during shooting is measured (TTL direct metering). Ru. Also,
In the shutter priority mode or program shutter mode, when the shutter is released, the movable reflection mirror 26 remains in a lowered state, and the light receiving element 25 starts aperture control, and When the aperture is stopped down to the determined aperture value, the movable reflection mirror 26 is lifted up, the front curtain 31 starts running, and the photographing optical path is opened. The shutter priority and program shutter exposure modes are only possible when the camera body 1 is equipped with a motor drive device 35 shown in FIGS. 3 and 4.

3 and 4 are partially cutaway plan views showing the main parts inside the case 36 of the motor drive device 35, which is attached to the camera body 1 of the single-lens reflex camera and performs aperture control and film winding. and a front view. When the case 36 of the motor drive device 35 is attached to the camera body 1, it has a horizontal portion 36a connected to the bottom surface of the camera body 1 and on which the camera body 1 is placed, and a shape that is easy to grasp at the right front of the camera body 1. It consists of a vertical part 36b arranged,
A motor 37 is arranged inside this vertical portion 36b. On the upper surface of the horizontal portion 36a, there is a winding coupler 38 for transmitting the rotation of the motor 37 to the winding mechanism of the camera body 1, and a winding coupler 38 for transmitting the rotation of the motor 37 to the winding mechanism of the camera body 1. Aperture control couplers 39 for transmitting the information are rotatably disposed. The above winding coupler 3
8 is connected to a winding coupler (not shown) which is disposed exposed on the bottom surface of the camera body 1 and works in conjunction with a winding mechanism, and the aperture control coupler 39 is
It is connected to an aperture control coupler 87 (see FIGS. 6 and 7), which is also arranged on the bottom surface of the camera body 1. In addition, the aperture control coupler 3
9, a mounting operation pin 40 is attached to the horizontal portion 36a.
is placed perpendicular to the top surface of the Further, on the left side thereof, a connecting electric signal pin 41 for electrically connecting with the camera body 1 is arranged. This electric signal pin 41 is connected to a stationary member 42 inside the case 36.
It is constantly biased by a spring 43 loaded between the camera body 1 and the electrical circuit in the case 36 so that it can contact an electrical signal pin (not shown) provided on the bottom of the camera body 1. (not shown) by a lead wire 44.

A drive gear 50 is connected via an electromagnetic clutch 45 to the drive shaft 37a of the motor 37, which is disposed in the vertical portion 36b with the drive shaft 37a facing downward.
That is, as shown in FIG. 5, a short cylinder 47 having a ring-shaped permanent magnet 46 fixed to its inner lower surface is fixed to the lower end of the drive shaft 37a.
Underneath, a disk-shaped electromagnetic iron 48 is held by a holding member (not shown) so as to be rotatable and to be able to move up and down a certain amount. An excitation coil 49 is wound around the rotating shaft 48a of the electromagnetic iron 48, and a driving gear 50 is fixed to the lower end of the rotating shaft 48a.
The excitation coil 49 is connected to an electric circuit inside the case 36. If the permanent magnet 46 is arranged so that the lower end facing the electromagnetic iron 48 is the S pole as shown in the figure, when the excitation coil 49 is energized, the electromagnetic iron 4
8 is magnetized so that the surface facing the permanent magnet 46 and the short cylinder 47 becomes the south pole. Therefore, when the excitation coil 49 is not energized, the electromagnetic iron 48 is attracted to the permanent magnet 46 and integrally connected to the short cylinder 47, so that the rotation of the drive shaft 37a of the motor 37 is caused by the rotation of the drive gear 5.
However, when the excitation coil 49 is energized, the electromagnetic iron 48 is excited, and the electromagnetic iron 48 is separated from the short cylinder 47, and the drive shaft 37a of the motor 37 is At this point, rotation is no longer transmitted to drive gear 50.

The drive gear 50 meshes with a pinion 53 rotatably supported at the tip of an electromagnetic plunger 51. As is well known, when the coil 52 is not energized, the electromagnetic plunger 51 is biased by the spring 54 and is in a rightward position.
When energized, it moves to the left against the spring 54. Therefore, while the pinion 53 is in mesh with the drive gear 50,
When the coil 52 is de-energized, it meshes with the gear 56 of the film winding transmission gear train 55, as shown by the solid line in FIG. 3, and when the coil 52 is energized, it meshes with the gear 58 of the aperture control transmission gear train 57. It moves to the position shown by the dashed line. In the film winding transmission gear train 55, a gear 59 meshes with the gear 56,
The gear 59 has a gear 61 integrally coaxial with the winding coupler 38 via worms 60b and 60c integrally provided at both ends of the long shaft 60a, and is configured to transmit transmission for aperture control. The gear train 57 is
A gear 62 meshes with the gear 58, and a gear 64, which is coaxially integrated with the aperture control coupler 39, is connected to the gear 62 through worms 63b and 63c, which are also integrally provided at both ends of the long shaft 63a. It is constructed by interlocking. A brake disk 65 is integrally formed on the long axis 63a of the worms 63b, 63c. In the vicinity of this brake disc 65, as shown in FIG.
A torsion spring 67 regulated by a torsion spring 67 is fixed to an immovable member with a screw 68, and the pressing force at the other end of the torsion spring 67 causes a brake pad 69 attached to the other end to press against the outer peripheral surface of the disc 65. The long axes 63a of the worms 63, 63 are in pressure contact at all times.
A rotational braking force is applied to the

Motor drive device 3 configured as above
The aperture control mechanism in the camera body 1, which is combined with the camera body 5, is constructed as shown in FIGS. FIG. 6 shows the motor drive device 35 mounted on the camera body 1.
FIG. 7 shows a state in which the film winding lever 3 is wound and the shutter is charged without the motor drive device 35 being mounted. On the outer wall surface of one side plate 71 of the mirror box 24 in the camera body 1, a charge lever 72 is disposed by a spindle 73 and rotates clockwise in conjunction with the winding operation of the winding lever 3 to enter the charging state. has been done. The charge lever 72 is given the ability to rotate counterclockwise by a spring 74 stretched between the tip of an arm 72a extending downward and a stationary member (not shown), and the charge lever 72 rotates counterclockwise in the middle of the arm 72a. A locking piece 72b formed by bending the protruding piece to the side plate 71 is attached to the support shaft 7.
6 makes contact with a locking lever 75 disposed on the side plate 71, and the rotation of the charge lever 72 in the counterclockwise direction is restricted at a predetermined position. This locking lever 75 is also given a counterclockwise rotational habit by a spring 77 stretched between an arm 75a extending downward and a stationary member (not shown), and is also given a counterclockwise rotational habit. The other arm 75b is locked to the locking piece 72b of the charge lever 72, so that the locking lever 75 is restricted from rotating in the counterclockwise direction. Further, on the lower surface of the other arm 75b of this locking lever 75, there is a projection for abutting against the locking piece 72b and holding the charge lever 72 in that position when the charge lever 72 is in the rotating position of the charging state. A piece 75c is formed.

The other arm 72c of the charge lever 72 extends forward, and a charge spring 78 is stretched between its tip and the aperture drive member 79. The rear end of the aperture drive member 79 is rotatably attached to the side plate 71 by the support shaft 73, and the charging spring 78 is tensioned near the front end, so that the charge lever 72 can be rotated. A clockwise rotational habit is provided when in the charge state position. The tip 79a of the diaphragm drive member 79 protruding forward from the side plate 71 reaches near the inner side of the body mount ring 10 (see FIG. 1), so that the photographing lens barrel 2 can be mounted on the camera body 1. At this time, the tip portion 7 is placed on the lower surface of the narrowing member 21 that protrudes rearward of the lens barrel 2.
9a is in contact with it. In the middle of the aperture drive member 79, there is a regulating piece 79b that extends upward and faces the lower surface of the other arm 72c of the charge lever 72, and an engaging piece 79 that extends downward and has a hook-shaped tip.
c is provided. This engaging piece 79c is adapted to engage with a hook portion 81a formed at the tip of the upper arm of a locking lever 81 attached to the side plate 71 by a support shaft 80. This locking lever 81 is given a counterclockwise rotational habit by a spring 82 stretched between the lower arm and a stationary member (not shown). When engaged with the engagement piece 79c, the diaphragm drive member 79 is rotated counterclockwise and remains stationary at a tight position regardless of the shutter charge. Further, an elongated aperture control portion 79d inclined toward the rear lower part is formed at a position in front of the engagement piece 79c of the aperture drive member 79, and the front end surface of the aperture control portion 79d is connected to the support shaft 73. It is a partially arcuate surface centered at , and a gear 83 is formed on the same surface. A gear 83 of this diaphragm control section 79d is adapted to mesh with a worm 84. The worm 84 is attached to the side plate 7
A bevel gear 86 is fixed to the upper end of a long shaft 85 which is rotatably and swingably attached to the lower end of the outer wall surface of 1 by means of a support part 91a.
is fixed. The bevel gear 86 is configured to mesh with a bevel gear 88 that is coaxially integrated with an aperture control coupler 87 rotatably provided on the bottom plate 1a of the camera body 1 at a position facing the aperture control coupler 39 of the motor drive device 35. It's summery.
The long shaft 85 having the worm 84 and the bevel gear 86 is given the habit of rotating counterclockwise by a spring 89 stretched between a fixed member (not shown), and the amount of rotation is The rotational position is limited to a range in which the shaft 85 comes into contact with a stopper pin 90 implanted in the side plate 71. Further, a motor drive attachment detection section 91 is provided on the support section 91a of the long shaft 85, and extends diagonally downward from the support section 91a toward an attachment through hole 92 formed in the bottom plate 1a of the camera body 1. are integrated. The support part 91 has this motor drive attachment detection part 91.
a long shaft 85 attached to the side plate 71 by a;
The worm 84 and the bevel gear 86 constitute a diaphragm electric control connecting member 93. The mounting through hole 92 is connected to the case 3 of the motor drive device 35.
The mounting operation pin 4 is formed to protrude from the upper surface of 6.
0, and therefore, when the motor drive device 35 is installed, the installation actuation pin 40
When the lens is inserted into the camera body 1 through the through hole 92, the motor drive attachment detection section 91 is pushed up by the pin 40 and the aperture electric control connecting member 93 is rotated, whereby the aperture drive member 79 is rotated. It is connected to a transmission gear train 57 for diaphragm control of the motor drive device 35. The tip of a display changeover switch 95 attached to the bottom plate 1a of the camera body 1 by an insulating member 94 is located above the motor drive attachment detection section 91, and the detection section 91 is connected to the attachment activation pin 40. When pushed up, the movable contact piece 95a of the display changeover switch 95 comes into contact with the fixed contact piece 95b. This display changeover switch 95 is for switching the display of the exposure mode.

Next, the operation of the exposure mode display device will be explained separately for the case where the motor drive device 35 is attached to the camera body 1 (a) and the case where the motor drive device 35 is not attached (b).

(a) When the motor drive device 35 is attached to the camera body 1.

In this case, as shown in FIG. 6, the mounting operation pin 40 protruding from the upper surface of the case 36 of the horizontal portion 36a of the motor drive device 35 is fitted into the mounting through hole 92 of the bottom plate 1a of the camera body 1. In addition, the aperture control coupler 38 on the motor drive device 35 side and the aperture control coupler 87 on the camera body 1 side
are fitted. When the motor drive attachment detection section 91 of the diaphragm electric control connection member 93 is pushed up by the attachment actuation pin 40 fitting into the through hole 92, the long shaft 85 moves integrally with the detection section 91 into the support section. The worm 84 rotates clockwise around the spring 91a against the rotational behavior of the spring 89.
is in mesh with a gear 83 formed on the aperture control portion 79d of the aperture drive member 79, and at the same time, the bevel gear 86 is in a state in mesh with a bevel gear 88 integrated with the aperture control coupler 87. That is,
If the bevel gear 88 is connected to the gear 83 via the bevel gear 86 of the aperture drive control connection member 93 and the worm 84, and the aperture control coupler 87 rotates,
The diaphragm drive member 79 is now in a state where it can rotate. In addition, as described above, the motor drive attachment detection section 91
By being pushed up, the movable side contact piece 95a
contacts the fixed side contact piece 95b and the display changeover switch 95 is closed, so that at this time all exposure modes controllable by the motor drive device 35 are displayed. That is, by closing the display changeover switch 95, the indicators 9a to 9f of the liquid crystal display member 9 provided on the top surface of the camera body 1 and their mode names are all displayed in the display state as shown in FIG. , and informs the user that various exposure modes can be selected, such as "Program Shutter (P),""Shutter Priority (S),""Aperture Priority (A)," and "Manual (M)." . Therefore, the user can select any one of the above modes by moving one of the indicators 9a to 9d of the liquid crystal display member 9 on the exposure mode switching lever 6. In addition,
When the exposure mode switching lever 6 is aligned with the indicators 9e and 9f, the power is turned off and the self-timer is activated, respectively.

Here, move the exposure mode switching lever 6 to the index 9.
Exposure control operation when the "program shutter (P)" exposure mode is selected in accordance with a. First, after setting the aperture ring 17 (see Fig. 1) to the aperture value that provides the minimum aperture diameter, when the release button (not shown) of the motor drive device 35 is pressed, the electromagnetic release mechanism (not shown) causes the above-mentioned The lower end of the locking lever 81 is pushed in the direction of arrow A, and the lever 81 rotates clockwise, thereby causing the hook 81a to engage with the engagement piece 79c of the aperture drive member 79. It comes off. At the same time, the third
In FIG. 4, the drive shaft 37a of the motor 37 rotates. At this time, since the excitation coil 49 of the electromagnetic clutch 45 is not energized, the electromagnetic iron 48 is attracted to the short cylinder 47 and integrated, that is, the electromagnetic clutch 45 connects the drive shaft 37a and the drive gear 50. When the switch is turned on, the rotation of the drive shaft 37a is transmitted to the drive gear 50. At this time, if the shutter charge is not being performed, the electromagnetic plunger 51 is pulled by the spring 54 because the coil 52 is not energized, and the pinion 53 is in a position where it meshes with the gear 56. The rotation of the drive gear 50 is transmitted via a pinion 53 to a film winding transmission gear train 55 to a gear 56.
→ Gear 59 → Worm 60b → Worm 60c →
The winding coupler 38 is rotated by the gear 61. By the rotation of the winding coupler 38, the shutter curtain and film of the camera body 1 are wound. At this time, since the film winding lever 3 of the camera body 1 is not operated, the charge lever 72 does not rotate clockwise but remains at the position shown in FIG. 6.

When winding of the shutter curtain and film is completed, the excitation coil 49 of the electromagnetic clutch 45
Once energized, the electromagnetic iron 48 turns into a short cylinder 47.
That is, by separating the electromagnetic clutch 45
turns off the connection between the drive shaft 37a and the drive gear 50, so that the rotation of the motor 37 is no longer transmitted to the drive gear 50, and then the coil 52 of the electromagnetic plunger 51 is energized and the pinion 53 is rotated as described above. From the gear 56 to the aperture control transmission gear train 5
The state is changed to mesh with the gear 58 of No. 7. Immediately thereafter, the excitation coil 49 of the electromagnetic clutch 45 becomes de-energized again, and the rotation of the drive shaft 37a of the motor 37 is transmitted to the drive gear 50. The aperture control transmission gear train 57 is connected via the pinion 53 to the gear 58 → gear 62 → worm 63b →
The diaphragm control coupler 39 rotates by being transmitted from the worm 63c to the gear 64.

As the aperture control coupler 39 rotates, the aperture control coupler 87 inside the camera body 1 rotates, and the rotational driving force of the coupler 87 is transmitted to the bevel gear 8.
8 → Bevel gear 86 of the aperture electric control connection member 93
The diaphragm drive member 79 is rotated clockwise around the support shaft 73 by the transmission from the worm 84 to the gear 83. As a result, the tip 79 of the aperture drive member 79
As a increases, the narrowing member 21 is raised so as to gradually narrow the diaphragm from the open state to the direction of the minimum aperture. At this time, the movable reflection mirror 26 is still in a lowered state as shown in FIG. Since the aperture is guided by the light receiving element 25, the light is measured from an open aperture state to a state where the aperture is gradually narrowed down. When the diaphragm member 21 reaches a predetermined aperture value based on a combination of aperture and shutter speed depending on the brightness of the subject, the electromagnetic clutch 45
Since the excitation coil 49 of the motor 37 is energized, the rotation of the drive shaft 37a of the motor 37 is not transmitted to the drive gear 50. The rotation of the member 79 is immediately stopped, and the narrowing member 21 is also stopped.

After the aperture control described above is performed, the movable reflection mirror 26 is lifted up by a mirror lifting mechanism (not shown), so that the reflection mirror 26 is retracted from the photographing optical path to a position 26A shown by the two-dot chain line in FIG.
When this happens, the shutter front curtain 31 starts running. When the photographing optical path is opened and the shutter front curtain 31 runs, reflected light from the front surface of the shutter front curtain 31 and the photosensitive surface of the film 32 exposed by the running of the front shutter curtain 31 is guided to the light receiving element 25. , from the time when the shutter front curtain 31 starts traveling, the light receiving element 2
The output of 5 is integrated to perform so-called TTL direct photometry. Then, when the integrated voltage reaches an appropriate voltage corresponding to the shutter speed determined from the aperture value set above, the shutter trailing curtain runs and the exposure ends. When the exposure is completed, the electromagnetic clutch 45 cuts off the current to the excitation coil 49, and the drive shaft 37a of the motor 37 is connected to the drive gear 5 again.
After entering the on state connected to 0, motor 3
7 is a drive shaft 37 which is supplied with a voltage of opposite polarity to the above.
a rotates in the opposite direction. Therefore, the rotational force is transmitted in the opposite direction from the drive gear 50 to the aperture control couplers 39 and 87 via the aperture control transmission gear train 57, and the bevel gear 88→86→worm 84→gear 83 and the above-mentioned reverse rotation drive. Since the force is transmitted, this causes the aperture drive member 79 to rotate counterclockwise. As the diaphragm drive member 79 rotates counterclockwise, the diaphragm member 21 in contact with the tip 79a of the member 79 moves down from the narrowed position to the open position. When the aperture drive member 79 rotates counterclockwise due to the reverse rotation of the motor 37 of the motor drive device 35 and reaches the initial position, at this point the engagement piece 7 of the aperture drive member 79
9c rotates the locking lever 81 slightly clockwise and then engages with the hook portion 81a. At this time, the movable reflection mirror 26 is also in a lowered state by a mechanism not shown. Thereafter, in the electromagnetic clutch 45, the excitation coil 49 is energized to disconnect the drive shaft 37a of the motor 37 and the drive gear 50, and then the coil 52 of the electromagnetic plunger 51 is de-energized and the pinion 53 is disconnected. is gear 5
6 will be engaged. After the rotation of the drive shaft 37a of the motor 37 is switched to normal rotation,
In the electromagnetic clutch 45, the excitation coil 49 is de-energized and the drive shaft 37a is connected to the drive gear 50, so that the rotation of the drive shaft 37a is controlled via the film winding transmission gear train 55. The signal is transmitted to the upper coupler 38, and at the same time the film is wound, shutter charge is performed.

Also, move the exposure mode switching lever 6 to the index 9b.
When the "Shutter Priority (S)" exposure mode is selected, the exposure control operation is performed in substantially the same manner as the exposure control operation in the "Program Shutter (P)" exposure mode.
In this case, prior to releasing the shutter, set the aperture ring 17 to the minimum aperture value as in the above case, and turn the shutter dial 11 (see Figure 1) to set the desired shutter speed. Set. The shutter speed preset information set by this dial 11 is led to the exposure calculation control section. Therefore, when the release button of the motor drive device 35 is subsequently pressed, the locking lever 81 is rotated in the direction of the arrow A, as described above, and the aperture drive member 79 is engaged with the locking lever 81. After being released, motor 37
The rotation of the drive shaft 37a is transmitted to the aperture drive member 79 via the aperture control transmission gear train 57 and the aperture electric control connection member 93.
9 rotates clockwise, and the narrowing member 21 rises. As the diaphragm member 21 is raised by the rotation of the diaphragm drive member 79, the subject light passing through the diaphragm, which is gradually narrowed down from the open state, is transmitted to the half of the movable reflection mirror 26 in the descending state. Transmissive section 26a and auxiliary mirror 2
7 to the photometric light-receiving element 25, when the aperture member 21 reaches a position where the aperture is narrowed down to the aperture value corresponding to the preset shutter speed, the electromagnetic clutch 45 is activated. The aperture drive member 79 is turned off, and the aperture driving member 79 stops rotating due to the braking of the brake disc 65 and the brake pad 69, and the aperture member 21 stops. After this, the movable reflection mirror 26
jumps up, the front shutter curtain 31 starts moving, and at the same time TTL direct metering starts.
That is, since the aperture is controlled to an aperture value that allows the preset shutter speed to be obtained, the shutter front curtain 31 starts running and the shutter front curtain 3
1 and the exposed photosensitive surface of the film 32 are guided to the light receiving element 25. At this time, the output of the light receiving element 25 is integrated to perform TTL direct photometry, and the integrated voltage is calculated as the shutter speed in seconds. When the appropriate voltage is reached, the shutter rear curtain runs and the exposure ends.

After the exposure is completed, the motor drive device 35 operates in the same manner as in the exposure mode of the above-mentioned "program shutter (P)", and the aperture drive member 79 is rotated counterclockwise by the driving force of the motor 37. At the same time, film winding and shutter charging are performed. Moreover, the movable reflection mirror 26 also descends.

As mentioned above, when the motor drive device 35 is attached to the camera body 1, the LCD display clearly shows that the exposure mode of "Shutter Priority (S)" or "Program Shutter (P)" can be selected. When these exposure modes are selected, the aperture drive member 79 is driven by the motor 37 of the motor drive device 35,
When a predetermined aperture value is reached, the aperture is controlled so that the aperture driving member 79 stops.
Note that during the aperture control described above, even if the braking force due to friction between the brake disk 65 and the brake pad 69 changes or decreases, it does not affect the exposure accuracy much. That is, the motor 37
There is no problem even if the rotating speed of the aperture drive member 79 increases due to the decrease in the braking force when the motor 37 is driven, and when the motor 37 is stopped and the aperture drive member 79
Even if there is a slight deviation between the rotation stop position of the aperture drive member 79 and the actual aperture value determined by the rotation stop position of the aperture drive member 79, the shutter time is always determined by TTL direct metering. Proper exposure will be performed.

With the motor drive device 35 attached to the camera body 1, an exposure mode other than the above-mentioned "shutter priority (S)" or "program shutter (P)" exposure mode, that is, "aperture priority (A)" or ,
The exposure control operation when the "Manual (M)" exposure mode is selected is as follows.

In the "Aperture priority (A)" mode, the exposure mode switching lever 6 is set to the index 9c, and in the "Manual (M)" exposure mode, the switching lever 6 is set to the index 9d. The main body 1 and the motor drive device 35 are in a state where they operate in each of the above modes. Since the aperture value is preset by the aperture ring 17, first
7 to preset the desired aperture value.
In the case of the "manual (M)" exposure mode, the shutter dial 11 is also rotated to set the desired shutter speed. Then, when the release button of the motor drive device 35 is pressed, the engagement between the locking lever 81 and the aperture drive member 79 is released by rotation of the locking lever 81, and then the motor 37's drive shaft 37a rotates forward, the coil 52 of the electromagnetic plunger 51 is energized, and the pinion 53 meshes between the drive gear 50 and the gear 58. After this, the electromagnetic clutch 45 is turned on. , the drive shaft 37a
The rotation is transmitted to the aperture control transmission gear train 57,
Furthermore, the aperture driving member 79 is rotated clockwise by being transmitted to the aperture electric control connecting member 93. In this case, the diaphragm drive member 79 rotates to the position where the diaphragm member 21 is raised to its maximum limit by the driving force of the motor 37, so that the diaphragm is controlled to be narrowed down to the preset aperture value. When the throttle member 21 is completely raised, the electromagnetic clutch 45 is turned off and the rotational force of the drive shaft 37a of the motor 37 is not transmitted to the throttle control transmission gear train 57, and the brake disc 65 and brake pad 69 are The braking force caused by this stops the rotation of the gear train 57 and the aperture electric control connecting member 93, so the aperture drive member 79 stops rotating.

After the aperture is narrowed down to the preset aperture value by the driving force of the motor 37, the movable reflection mirror 26 is flipped up to open the photographing optical path, and the shutter front curtain 31 moves. In the "aperture priority (A)" mode, the integration of TTL direct metering starts as soon as the front shutter curtain 31 starts running, so that The reflected light is received by the photometric light-receiving element 25, and when the integrated amount of received light corresponds to the appropriate exposure amount, the shutter trailing curtain moves to end the exposure.

After exposure is complete, press “Program Shutter (P)”.
As in the case of the exposure mode "Shutter Priority (S)", the aperture drive member 79 is rotated counterclockwise by the operation of the motor drive device 35 and returned to its original position, and then the film winding and shutter shutter operations are performed. ji will be carried out. Moreover, the movable reflection mirror 26 also returns to the lowered state.

(b) When the motor drive device 35 is not attached to the camera body 1.

In this case, as shown in FIG. 6, the mounting operation pin 40 (the third,
4) is not inserted, the motor drive installation detection part 91 of the aperture electric control connecting member 93 is not pushed up by the pin 40, and therefore, the long axis 85 of the aperture electric control connecting member 93 is not inserted into the spring. Due to the rotational behavior of 89, it is in a rotational position where it abuts against the stopper pin 90. Therefore, the worm 84 is connected to the gear 8.
3, and the bevel gear 86 is separated from the bevel gear 88.
The aperture electric control connecting member 93 is in a state where it cannot transmit the rotation of the aperture control coupler 87 and is in a state in which the aperture drive member 79 is disengaged from the aperture drive member 79 for electric control. Further, since the motor drive attachment detection section 91 is not pushed up, the display changeover switch 95 is in an open state with the movable side contact piece 95a and the fixed side contact piece 95b separated from each other. Therefore, at this time, when the motor drive device 35 is not installed, an uncontrollable exposure mode is not displayed. That is, when the display changeover switch 95 is open, among the indicators 9a to 9f of the liquid crystal display member 9 provided on the top surface of the camera body 1 and their mode names, when the motor drive device 35 is installed, The indicators 9a and 9b for "Program Shutter (P)" and "Shutter Priority (S)", which can only be controlled, and their mode names have disappeared as shown in FIG. Therefore, in this case, when selecting the mode, the user selects an uncontrollable "program shutter (P)" or "shutter priority (S)" exposure mode that is not displayed on the liquid crystal display member 9. Instead, you can select the displayed exposure mode of "Aperture Priority (A)" or "Manual (M)."

The aperture control operation when the motor drive device 35 is not attached to the camera body 1 is well known.
First, when selecting the exposure mode, align the exposure mode switching lever 6 with the index 9c for "Aperture Priority (A)" mode or the index 9d for "Manual (M)" mode, and then rotate the aperture ring 17. Preset the desired aperture value. "Manual (M)"
When the exposure mode is selected, the shutter dial 11 is further rotated to preset the desired shutter speed. Film winding lever 3
As shown in FIG. 7, when the charge lever 72 is rotated, the lower end of the arm 72a is pushed in the direction of arrow B against the force of the spring 74, and the charge lever 72 rotates clockwise, pulling the charge spring 78. do. When the charge lever 72 is rotated, the locking piece 72b of the lever 72 is in sliding contact with the lower surface of the protruding piece 75c of the locking lever 75, which has a tendency to rotate counterclockwise, and the charge lever 72 is rotated in a predetermined position. When the lever 72 is rotated to the charge position, the locking piece 72b of the lever 72 engages with the protruding piece 75.
c, and the charge lever 72 is locked in the charge state position in which the charge spring 78 is pulled to the maximum. Therefore, when the shutter release button 4 is subsequently pressed down, the lower end of the locking lever 81 is pushed in the direction of arrow A by the release mechanism and rotated clockwise, so that the aperture drive member 79
is disengaged from the locking lever 81 and rotated clockwise by the tensile force of the charging spring 78. Due to this rotation of the aperture drive member 79, the aperture member 21 is rapidly raised to the uppermost position, and the aperture is narrowed down to the preset aperture value. Thereafter, when the movable reflection mirror 26 is flipped up to a position 26A shown by a two-dot chain line in FIG. will be carried out. In the case of the "Manual (M)" mode, the rear shutter curtain will run and the exposure will end when the preset shutter time has reached the above-mentioned preset shutter time from the time when the front curtain 31 starts running. In the case of the "aperture priority (A)" mode, at the time when the front curtain 31 starts traveling, photometry of the reflected light from the front surface of the front curtain 31 and the photosensitive surface of the film 32 that enters the light receiving element 25 is started,
TTL direct metering is performed. Then, when the photometric integrated voltage reaches a voltage corresponding to an appropriate exposure amount that changes depending on the film sensitivity, the shutter trailing curtain runs and the exposure ends.

When the shutter rear curtain moves, the movable reflective mirror 26 is lowered by a mechanism not shown.
Further, the locking lever 75 is rotated clockwise by pushing the lower end of one arm 75a in the direction of arrow C against the force of the spring 77, so that at this time the charge lever 75 is pressed against the protrusion 75c of the lever 75. Locking piece 7
2b is released and the charge lever 72 is released from the spring 7.
It rotates counterclockwise due to the rotational habit of 4.
When this charge lever 72 rotates counterclockwise, the lever 72 moves the regulating piece 7 of the aperture drive member 79.
9b, this causes the aperture drive member 7 to
9 also rotates counterclockwise together with the charge lever 72, is engaged with the locking lever 81, and returns to its initial position (see FIG. 6).

As described above, according to the present invention, the selection switching position of a plurality of exposure modes is displayed on the liquid crystal, and when the motor drive device is attached to the camera body, all of the positions on the liquid crystal display member are displayed. The exposure mode selection switching position is displayed, and when the motor drive device is removed from the camera body, the selection position of exposure modes such as shutter priority and program shutter, which can control exposure only when the motor drive device is attached, is displayed. Therefore, it is possible to prevent the user from making an inadvertent operation error such as erroneously switching the exposure mode.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a single-lens reflex camera having an exposure mode display device according to the present invention, with the photographing lens barrel removed from the camera body, and FIG. 2 is a perspective view of the single-lens reflex camera shown in FIG. 1 above. FIG. 3, a cross-sectional view of the photometric optical system of the REX camera, shows the motor drive device that cooperates with the camera shown in FIG. 1 above.
Figure 4 is a partially cutaway plan view showing the main parts.
A partially cutaway front view showing the main parts of the motor drive device shown in FIG. 3 above, and FIG. 5 shows the main parts of the electromagnetic clutch used in the motor drive device shown in FIGS. 3 and 4 above. Enlarged front view with section cut away,
FIG. 6 is a front view of the aperture control mechanism inside the camera body when the motor drive device shown in FIGS. 3 and 4 is attached to the camera shown in FIG. 1, and FIG.
A front view of the aperture control mechanism inside the camera body when the motor drive device is not installed in the camera shown in FIG. 1 above, and FIG. 8 is a front view of the aperture control mechanism in the camera body shown in FIG. ,
Main part plan view showing the display state of the liquid crystal display member, No. 9
This figure is a plan view of a main part of the camera shown in FIG. 1, showing the display state of the liquid crystal display member when the motor drive device is not attached. 1...Camera body, 6...Exposure mode switching lever,
9...Liquid crystal display member, 9a-9f...Index, 40...Putting operation pin (attachment actuating member), 95...Display changeover switch.

Claims (1)

[Claims for Utility Model Registration] On the camera body, the selection switching position of a plurality of exposure modes including at least one of the shutter priority exposure mode and the program shutter exposure mode is displayed using a liquid crystal display. a liquid crystal display member provided as shown in FIG. a display changeover switch that turns off the display of the shutter priority exposure mode and/or program shutter exposure mode selection switching position on the liquid crystal display member when the camera is not attached to the camera; Device.