JPS61212835A - Single-lens reflex camera - Google Patents

Abstract

PURPOSE:To reduce the weight and space of a single-lens reflex camera by providing a mirror, its hopping-up member, a stop member, stopping-down member, and an electromagnet which controls them. CONSTITUTION:A lens system 14 and the stop member 16 are arranged in a lens barrel, and the slanting mirror 18 and a shutter 20 are arranged in the camera body. When an electromagnet 3 is powered on and a attractive force is eliminated, a mirror hopping-up lever is released from being constrained and the mirror 18 hops up. The stopping-down member which abuts on a projection for stop driving formed on the stop member 16 to move the member 16 and a lock member which constrains its motion associatively are controlled by the electromagnet 3. Thus, the mirror 18 and stop member 16 are driven and controlled by the one electromagnet 3 to reduce the weight and space.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a single-lens reflex camera, and more particularly to a TTL direct photometry-eye reflex camera.

[Background of the invention]

A single-lens reflex camera is provided with a large number of movable members. For example, a mirror that is disposed obliquely in the optical path of incidence on the film within the main body and retracts in both directions during photographing, a front curtain and a rear curtain that constitute a focal-brain shutter, an aperture section H that changes the aperture, and the like are used. These movable members are driven simultaneously or in a fixed order, and their drive control is usually performed using electromagnets. That is, the mirror, front curtain, rear curtain, diaphragm member, etc. are biased in one direction in advance by a spring biasing means, and are in a state of being locked by a locking member against the biasing force. In order to release the locking state of each locking member, an electromagnetic magnet is provided for each locking member, and by giving an operating signal to the electromagnetic magnet throat, the locking member is moved, flipping up the mirror, or moving the front curtain. , the rear curtain, etc. are moved. However, in the conventional single-lens reflex camera, each movable member is provided with an electromagnetic magnet, which increases the weight and space, and also increases the product price.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and it is an object of the present invention to propose a single-lens reflex camera in which drive control of a mirror and an aperture member can be performed using a single magnet.

[Summary of the invention]

In order to achieve the above object, the present invention includes a mirror disposed obliquely in the optical path of incidence on the film within the camera body, and a mirror bouncer that retracts the mirror from the optical path of incidence in conjunction with the shirt release operation. a gear transmission means linked to the mirror flip-up member; an aperture drive protrusion formed on the aperture member; and an aperture member that comes into contact with the aperture drive protrusion to move the aperture member and change the aperture. and the speed regulating mechanism of the narrowing member that is interlocked with the narrowing member, and the movement of the mirror flip-up member is restrained by contacting the constituent members of the Yaa transmission means, and the movement of the mirror flipping member is restrained by contacting the constituent members of the speed regulating mechanism. It is characterized by comprising a locking member that restricts movement, and an electromagnetic magnet that activates the locking member and releases the restriction of the mirror flip-up member and the narrowing member by the locking member.

[Embodiments of the invention]

Preferred embodiments of the single-lens reflex camera according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows the overall shape of a single-lens reflex camera to which an embodiment of the present invention is applied, and a lens barrel 12 is provided on the front surface of a camera body 10.
2 includes a photographing lens system 14 and an aperture member 16 shown in FIG.
is installed.

Further, a mirror 18 is disposed obliquely within the camera body 10, and the mirror 18 is arranged at an oblique position to send the subject light to the finder optical system, and also flips up during photographing to expose the film surface 22. A member designated by the reference numeral 20 is a focal plane shutter, and as shown in FIG. 2, the focal plane shutter 20 is composed of a leading curtain 2OA and a trailing curtain 20B. At a position on the side of the mirror 18 and out of the optical path of the subject light, there is a light receiving element 24 made of an SPD or the like.
24 is provided, and this light receiving element 24 receives the reflected light from the focus plane shutter curtain 20 during photometry and measures the subject brightness, and during exposure the focal plane shutter curtain 20...
The shutter time can be controlled by receiving reflected light from the twilight 20 and the film surface 22.
□FIG. 2 is a block diagram showing the circuit configuration of the control section of the single-lens reflex camera according to this embodiment. In FIG. 2, the detection output from the light receiving element 24 is input to an integrating circuit 26 and integrated, and in addition to the input from the light receiving element 24, information such as film sensitivity is input to the integrating circuit 2 circuit 28. Based on the information of magnet Mgl, Mg2,
When the magnet Mg is activated, the leading curtain 2OA runs, and when the magnet Mg2 is activated, the trailing curtain 2OB runs to expose the film 22.The magnet Mg 3 controls the aperture as will be described later. The drive of the member 16 and the mirror 18 is controlled.

3 and 4 show a control mechanism for the diaphragm member 16 and mirror 18 using a magnet Mg 3. Third
Figure 4 shows the mirror drive mechanism viewed from the side of the camera body, with the front of the camera on the left side of the figure, and Figure 4 shows the mirror and aperture member drive mechanism viewed from the bottom of the camera body. In the figure, the left side is the front of the camera. As shown in FIG. 3, the mirror 18 is supported so as to be swingable about a shaft 30. As shown in FIG. The mirror flip-up lever 32 is the shaft 3
4, and is biased by a spring 36 to rotate counterclockwise (mirror flip-up direction) about a shaft 34 in FIG. A contact portion 38 is formed at the upper end of the mirror flip-up lever 32, and as will be described later, when the mirror flip-up lever 32 is released, the mirror flip-up lever 32 is rotated by the spring 36. The biasing force rotates the mirror 18 counterclockwise, pushes the pin 40 formed on the side surface of the mirror 18, moves the mirror 18 clockwise about the shaft 30 by m1, and removes the incident light from the optical path to the film. Evacuate-
Ill. The charge lever 42 is rotatably supported around the shaft 34, and is biased by a spring 44 to rotate clockwise around the shaft 34. Lower end 46 of charge lever 42
engages with the stepped portion 50 of the regulating member 48, and is regulated to the position shown in FIG. 3 against the rotation biasing force of the spring 44.

The regulating member 48 is rotatably supported around a shaft 52 and urged by a spring 54 to rotate counterclockwise, that is, in the direction of engagement with the lower end 46 of the charge lever 42 . Regulation member 4
8, when the rear curtain 22B finishes running, its lower end 56 is pushed in the direction of the arrow, and the engagement with the charge lever 42 is released. When the engagement relationship between the charge lever 42 and the regulating member 48 is released, the charge lever 42 is rotated clockwise around the shaft 34 by the force of the spring 44, and the end 43 of the charge lever 42 is rotated clockwise around the shaft 34, and the end 43 of the charge lever 42 is rotated clockwise around the shaft 34. Press down to return to the original diagonal position. The charge lever 42 is interlocked with a shutter charge mechanism that does not rotate, and after returning the mirror 18 to its original position, the spring 4 receives a force in the direction of arrow B during film winding.
It was forced to return to the position shown in Figure 3 against the force of 4-A.

A pin 58 is protruded from one end of the mirror flip-up lever 32, and this pin 58 is fitted into the four parts 62 of the fan-shaped gear 60 as shown in the fourth section. The fan-shaped gear 60 is rotatably supported around a shaft 64, and its gear portion 66 meshes with an adjacent gear 68. Further, a gear 70, which is provided coaxially with the gear 68, meshes with a gear 72, and a cam 74 is provided coaxially with the gear 72. The cam 74 is rotatable about a shaft 76, and has a cam surface 78 and a protrusion 80 formed on its outer peripheral surface. The protrusion 80 of the cam 74 is connected to a claw 84 formed at the lower end of the locking lever 82.
Therefore, in this locked state, the mirror flips up against the biasing force of the upper lever 32 and the third spring 36.
It will be restrained in the position shown in the figure.

The locking lever 82 is rotatably supported around a shaft 86 and biased by a spring 85 to rotate counterclockwise, that is, in the direction of engagement with the protrusion 84 of the cam 74 . A pressing piece 88 is rotatably supported coaxially with this shaft 86 . The pressing piece 8B is urged to rotate clockwise in FIG. 4 about the shaft 86 by a spring 90 provided at its left end, that is, in the direction away from Magneso I:Mg3, and the protrusion 92 of the pressing piece 88 is pressed against the locking lever. 8
The right end 83 of 2 is pressed and biased. A suction piece 96 is provided on the pressing piece 88 . Magnet Mg
3 is constructed as a combination magnet, and when energized, the attraction force disappears, and when the energization is cut off, the attraction force is generated.

When energization is applied to Mg3, the pressing piece 88 is separated from the magnets 1-Mg3 and rotates clockwise around the lever 86 due to the biasing force of the spring 90. At this time, the protrusion 92 presses the right end 83 of the locking lever 82, and the locking lever 82 rotates clockwise so that its pawl 84 is disengaged from the protrusion 80 of the cam 74.

A driven lever 98 actuated by a cam 78 is pivotally supported on the shaft 86, and the driven lever 98 is urged to rotate clockwise by the spring 85, so that one end 99 of the driven lever 98 and the pin 82A of the locking lever 82 are This means that they are urged to join together. When the cam 74 rotates counterclockwise and the cam surface 78 rides on the tip 102 of the driven lever 98, the driven lever 98 rotates counterclockwise against the biasing force of the spring 85. The pressing piece 88 is pressed counterclockwise to cause the suction piece 96 to be attracted to the Mg3 magnet. Further, when the driven lever 9B does not ride on the cam surface 78, the end portion 99 comes into contact with the pin 82A planted on the locking lever 82 due to the rotation biasing force of the spring 85, and the locking lever 82 is moved to the fourth position. Keep it in the position shown in the figure.

On the other hand, the narrowing lever 104 is rotatably supported around a shaft 106, and this narrowing lever 104 is urged to rotate counterclockwise around the shaft 106 by a spring 108. A charging piece 110 is supported on a shaft 106 coaxially with the aperture lever 104, and the charging piece 110 is rotated counterclockwise about the shaft 106 by a spring 112 whose one end is locked to a pin 113 of the charging piece 110. Forced. The other end of the spring 112 is locked to the narrowing lever 104 via a pin 114. With such a configuration, the edge surface 111 of the charge piece 110 is aligned with the protrusion 60A of the fan-shaped gear 60.
The charging piece 110 is charged by being pushed against the force of the spring 112. At this time, the aperture lever 104
is restrained by an ankle 138, which will be described later, and does not rotate. One end 118 of the aperture lever 104 is in a position where it can come into contact with an aperture drive pin 120 of an aperture ring (not shown), and when the aperture lever 104 rotates clockwise about the shaft 106, the aperture drive pin 120 moves from the open position to the minimum position. It will be moved towards the aperture.

A bottle 122 is installed on the narrowing lever 104, and this bottle 122 is fitted into a groove 126 of the fan-shaped gear 124. A gear portion 128 of the fan-shaped gear 124 meshes with a gear 130, and a gear 132 coaxial with this gear 130 meshes with the gear 134. This gear 134 and the same axle wheel 13
An ankle 138 is positioned opposite to the ankle 1.
38 is the escape wheel 1 by swinging around the shaft 140.
36 is fed one tooth at a time. As a result, the aperture lever 104 rotates slowly without rapidly rotating. That is, the gears 128 to 134, escape wheel 136, and pallet wheel 138 constitute a speed regulating mechanism for the narrowing member 104.

Further, one end 142 of the locking lever 82 is in a position where it can come into contact with the pallet pallet 138, and when it makes contact with the pallet pallet 138, the pallet pallet 138 is pressed against the escape wheel 136, and the rotation of the narrowing lever 104 is restrained. The operation of the embodiment of the single-lens reflex camera according to the present invention will be explained with reference to the timing chart shown in FIG. First, when the shirt release button is pressed halfway, the switch S1 is closed and photometry is started (FIG. 5(a)). When the shirt release button is completely pushed in (Fig. 5(b)), the switch S2 is closed and the magnet Mg3 is energized (Fig. 5(b)).
C)), the adsorption force by the magnet Mg 3 disappears. When the attraction force disappears, the push-shogetsu 88 rotates clockwise around the shaft 86 due to the rotation biasing force of the spring 90, causing the locking lever 82 to rotate clockwise around the shaft 86.

When the locking lever 82 rotates in the forward direction, the pawl 84 engages the cam 7.
It comes off from the protrusion 80 of 4. As a result, the restraint of the mirror flip-up lever 32 is released, and the mirror flip-up lever 32 is released.
The mirror 18 is rotated clockwise in FIG. 3 about the shaft 34 by the spring 36, and the mirror 18 is flipped up (FIG. 5(e)).
.

On the other hand, due to the disengagement between the claw 84 and the protrusion 80, the fan-shaped gear 6
0 rotates counterclockwise, and the rotation of the fan-shaped gear 60 causes the protrusion 60A to press the charge piece 11'0. In this state, the pallet lever 138 is pressed against the left end 142 of the locking lever 82, so the rotation of the escape wheel 136 is restrained, so the narrowing lever 104 does not move and the charge piece 11
0 moves and charges the spring 112 with biasing force. Also, in this state, one end 99 of the driven lever 98 is in contact with the pin 82A of the locking lever 82, and therefore the locking lever 82A is in contact with the pin 82A of the locking lever 82.
2 is in the position shown in FIG. 4 against the biasing force of the spring 85, and in this state, its end 142 presses the pallet wheel 138 against the escape wheel 136, so that the movement of the narrowing lever 104 is stopped. be. When the fan-shaped gear 60 rotates, the cam surface 78 eventually pushes up one end 102 of the driven lever 98, and the driven member 98 rotates counterclockwise against the biasing force of the spring 85, the pin 82A of the locking lever 82 is rotated. and the end 99 of the driven lever 98 is released, and the locking lever 8
2 is rotated counterclockwise by the biasing force of the spring 85, and the suction piece 96 is pressed against and attracted to the Mg3. At the same time, the left end 142 of the locking lever 82 separates from the ankle 138, releasing the restraint of the ankle 138. This causes the aperture lever 104 to release the already charged spring 112.
It begins to rotate under the influence of the rotation biasing force. Photometry is performed in a range l until one end 118 of the aperture lever 104 reaches the aperture drive pin 120 at the open position, and the aperture drive pin 120 is moved to a predetermined position based on this photometric value. Electrification is applied and the movement of the aperture lever 104 is stopped (FIG. 5Cf, (g)).

Thereafter, Mgl and Mg2 are activated based on the photometric value, the front curtain 2OA and the a curtain 20B are moved, and photographing is completed (FIGS. 5(h) and (I)).

After shooting, the mirror 18 is pushed down by the charge lever 42 when the film is wound up, and returns to the position shown in FIG.
becomes.

〔Effect of the invention〕

According to the single-lens reflex camera according to the present invention as described below, both the mirror bounce and the aperture part A can be controlled with one magnet.
This has the effect of reducing the weight and space of an eye reflex camera.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the general shape of a single-lens reflex camera to which an embodiment of the single-lens reflex camera according to the present invention is applied, and FIG. 2 is a block diagram showing the structure of the control section of the embodiment according to the present invention. , Fig. 3 is a side view showing the structure of the mirror flip-up mechanism, Fig. 4 is a bottom view showing the aperture control mechanism, and Fig. 5 is a side view showing the structure of the mirror flip-up mechanism.
The figures are timing charts 1 to 1 showing the operation timing of an embodiment according to the present invention. 16... Aperture member, 18... Mirror, 2O
A: front curtain, 20B: rear curtain, 22: film surface, 24: light receiving element, 28: control circuit,
132... Mirror flip-up lever, 104.
...Aperture lever, 120...Aperture drive pin, Mg 3...Magnet.

Claims (1)

[Claims] A mirror disposed obliquely in the optical path of incidence to the film within the camera body, a mirror flip-up member that retracts the mirror from the incident optical path in conjunction with shutter release operation, and a gear transmission means linked to the mirror flip-up member. , a diaphragm driving protrusion formed on the diaphragm member, a diaphragm member that comes into contact with the diaphragm driving protrusion to move the diaphragm member to change the diaphragm, and a speed regulating mechanism for the diaphragm member that is interlocked with the diaphragm member. a locking member that comes into contact with a component of the gear transmission means to restrain the movement of the mirror flip-up member and also comes into contact with a component of the speed regulating mechanism to restrain the movement of the narrowing member; and the locking member is actuated. A single-lens reflex camera comprising: a mirror flip-up member and an electromagnetic magnet for releasing the restriction of the diaphragm member by the locking member.