JPH0490531A - Counter device for film - Google Patents

Abstract

PURPOSE:To expand the degree of freedom at the position of a film counter in a camera and to make the camera compact by converting the back and forth motion of an electromagnetic driving member such as a plunger to the revolving motion and intermittently feeding a frame number disk for the film. CONSTITUTION:The electromagnetic driving member 5 which is moved back and force, two cam ring parts 9a and 9b provided with a saw-tooth-like can on the whole circumference and a rotating member 7 which is moved back and forth integrally with the driving member 5 and which can be rotated are provided. By mutually making the rotating member 7 abut on the cam ring parts 9a and 9b by the back and forth motion of the driving member 5, the back and forth motion is converted to the revolving motion. Besides, by rotating the frame number disk 10 where the frame number of the film is displayed by a prescribed angle by one and displaying the frame number of the film, a film counter device can be made into a unit. Therefore, need for interlocking with a sprocket is eliminated and the degree of the positional freedom in the camera is expanded. Besides, the design of the camera is made various and the camera is made compact.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a film counter device for a camera.

[Conventional technology]

Conventional film counters include:

Mechanical film counter: A film counter that mechanically advances intermittently by rotating a sprocket that engages with the film perforations.

Liquid crystal counter: A device that is electrically linked to sequences such as shutter release and film advance, and displays the number of films on a liquid crystal display.

[Problem that the invention is trying to solve]

However, the above conventional example has the following drawbacks.

・Since it is necessary to intermittent feed the number plate by mechanically interlocking with the perforation of the mechanical counter film or the sprocket that meshes with it, the number plate must be placed in a position where it can easily be mechanically interlocked with the sprocket. There is no flexibility in positioning it within the camera, which hinders the miniaturization of cameras and the diversification of designs.

-Liquid crystal counter The cost of the counter is high because the liquid crystal display board, the drive circuit, the means for connecting the liquid crystal display board and the drive circuit, etc. are expensive.

[Means to solve the problem]

According to the present invention, there is an electromagnetic drive member that reciprocates, two cam ring portions having serrated cams around the entire circumference, and a rotary member that reciprocates and is rotatable integrally with the electromagnetic drive member. By alternately bringing the rotating member into contact with the two cam ring parts during the forward and backward movements of the driving member, the reciprocating motion is converted into rotary motion, and the number board that displays the number of films is rotated by a certain predetermined angle. By displaying the number of film sheets, the film counter device can be made into a unit, eliminating the need for interlocking with the sprocket.
The degree of freedom in positioning within the camera is increased, and the design of the camera can be diversified, and the camera can also be made more compact.

〔Example〕

1 to 5 show a first embodiment of the present invention, in which 1 is a winding made of conductive wire, 2 is a bobbin, 3 is a yoke made of a material with high magnetic permeability, such as pure iron, and 4 is the same. A fixed yoke made of a material with high magnetic permeability is fixed to the yoke 3 and fitted into the inner diameter of the bobbin. A plunger 5 is made of a material with high magnetic permeability, and when the winding 1 is energized, it is drawn into the bobbin 2 by electromagnetic force. Reference numeral 6 denotes a compression spring which acts between the yoke 3 and the ring portion 5a of the plunger 5 and moves the plunger 5 out of the bobbin (upward in the figure).
is energized. 7 is a rotating member having a plurality of claws 7a around it, 8 is a step screw for rotatably attaching the rotating member to the plunger 5, and the rotating member 7 is rotatably fitted in the hole 7b. . Reference numeral 9 denotes a ring-shaped member having two cam ring portions (9a, 9b) in which a plurality of sawtooth cams are formed around the entire circumference, and is fixed to the yoke 3 coaxially with the bobbin 2. Also, 9a and 9b are shown in Figures 2 and 4.
As shown in the figure, the peaks are located half a pitch apart. l
O is a number board for displaying the number of frames of the film, which is rotatably fitted into a pin lla of a base plate 11 and a hole 10a, and is sandwiched between a ring-shaped member 9 and a base plate 11 to regulate the vertical direction. Numbers indicating the number of remaining films or the number of frames that have been shot are written on the top of the number disc 10. In addition, the rotating member 7
The pin 7C and the hole 10b of the number plate 10 are fitted to be slidable in the vertical direction. The configuration is such that only the rotational motion component of the motion of the rotating member is transmitted to the number board 10. Reference numeral 12 denotes a photointerrupter, which is fixed to the ring-shaped member 9 and is used to detect the rotational position of the number board 10. 1st
In the state shown in the figure, the coil 1 is not energized, the rotating member, step screw, and plunger 5 are pressed upward by the spring 6, and the claw portion 7a of the rotating member 7 is shaped like a ring as shown in FIG. It abuts the serrated cam 9a of the member 9. When the coil 1 is energized, the plunger 5 is drawn into the bobbin 2 by electromagnetic force against the urging force of the spring 6 and moves downward. At this time, the claw portion 7a of the rotating member 7 comes into contact with the serrated cam 9b-1, and when it goes further down, the rotating member 7 does not rotate and the lower end of the rotating member 7a contacts the cam 9b-1.
It enters the trough, as shown in FIGS. 3 and 4. As a result, the number board 10 is moved downward by β and rotated by α.
This means that the number of discs 10 has moved by 1, and the number of discs 10 is α due to pin 7C.
Rotate by 1.

Next, when the power to the coil l is cut off, the plunger, step screw, and rotating part 7 move upward by the spring 6, and the upper end of the claw part 7a of the rotating member 7 contacts the cam 9a-2, and the rotating member 7 moves upward. It moves β in the rotational direction and α2 in the rotational direction. As a result, the number board 10 is rotated by α2 by the pin 7C. In the same way,
When the coil 1 is energized again, the claw portion 7a comes into contact with the cam 9b-1, moves downward by α1 in the β rotation direction, and the number board IO rotates α1.

In this way, the coil 10 is repeatedly energized and de-energized, thereby rotating the number plate 10 by α1 when energized and α2 when de-energized. Therefore, if energization and interruption are performed once by a known electric circuit for each frame of one frame, the number board 10 will rotate by α1+α2 and the frame number display will advance by one frame. FIG. 5 is a top view, and numeral 13 indicates a frame number indicating arrow, which is formed by printing or engraving on a cover (not shown). The number disc 10 is rotating in the direction A (. After all the exposure to the film is completed, the number disc 10 must be returned to its initial position. To do this, the coil must be energized and cut off repeatedly, and the number disc 10 is rotated and stopped when the photo ink clubter 12 detects the hole 10c of the number board 10. As a result, the number board 10 has rotated 360° and returned to the initial position shown in FIG.

In this embodiment, the plunger 5 and the rotating member 7 are rotatably coupled, but even if the plunger 5 and the rotating member 7 are fixed together so as not to be rotatable, if the plunger cross section is made circular, the plunger 5 can rotate together with the plunger 5. can achieve the same purpose.

[Other Examples]

The position in which the claw portion 7a of the rotating member 7 when energizing the coil 1 should move to the left from 9a-1 to 9b-1 and from 9b-1 to 9a-2 when power is cut off is shown in FIGS. 2 and 4. During this process, due to some kind of disturbance, such as an impact, 9a-1 to 9b-
0 or from 9b-1 to 9a-1, the plunger 5 is prevented from rotating as shown in FIGS. 6, 7, and 8, and the rotating member 7 is
If a one-way clutch is inserted between the plunger 5 or the stepped screw, the operation will be more reliable.

Fig. 6 is a longitudinal sectional view, Fig. 7 is a BB cross-sectional view of Fig. 6,
FIG. 8 is a cross-sectional view taken along line B-B in FIG. There is a key groove 5b for prevention, and the bobbin 2 is fitted to the bobbin 2a of the bobbin 2 so as to be slidable in the vertical direction. Assuming that the rotating member should originally rotate in the A direction due to the vertical movement of the plunger, the claw portion 14a and the claw portion 7c rotate in the direction A as shown in FIG.
Rotation in the opposite direction is prevented.

Further, as a means for returning the initial position of several discs, it is possible to use the following configuration without detecting the position using a photointerrupter (FIGS. 9 to 12).

15 is a rotating disk, which is rotatably fitted into the dowel lla of the base plate 11. The pin 7c is fitted into the hole 15b of the rotary disk so as to be slidable in the vertical direction, and only the rotational motion component of the rotary member 7 is transmitted to the rotary disk (the hole 1 of the number disk 10 in the first embodiment is
0b). A compression spring 16 has one end in contact with the ring-shaped member 9 and urges the rotating disk 15 upward. 1
Reference numeral 7 denotes a multi-plate board, which is rotatably fitted to the llb portion of the main plate 11 at 17b, and is regulated in the upper direction by a stepped portion 11c and in the lower direction by a lid.

Reference numeral 18 denotes a reset lever, which is rotatably attached to a base plate (not shown) at a portion 18b. 18 is rotated to the left so that the vertically bent portion 18a abuts against 15d of the rotary disk 15 and pushes it down.

A spring 19 has one end attached to a base plate (not shown) and the other end attached to a reset lever, urging the reset lever to rotate in the E direction. Note that the urging force of the spring 19 is set to be stronger than the force of the spring 16. Reference numeral 20 denotes a stopper protruding from the base plate (not shown), which restricts counterclockwise rotation of the reset lever 18.

Reference numeral 21 denotes a back cover, and when the back cover is closed, a protrusion 21a pushes the vertically bent portion 18c of the reset lever 18 to the left. When opening the back cover, the back cover moves in the D direction, and the reset lever 18 rotates in the E direction due to the biasing force of the spring 19, thereby pushing down the rotating disk 15 against the biasing force of the spring 16. It has become.

A spring 22 has one end attached to a portion 17d of the number board 17 and the other end to a base plate (not shown), urging the number board 17 in the counterclockwise direction. Reference numeral 23 denotes a stopper on the main plate (not shown), which restricts counterclockwise rotation by coming into contact with 17e of the number plate 17, and returns the number plate 17 to the initial position (first position).
This is for positioning in Figure 1).

The number plate 17 and the rotary disk 15 are normally pressed against each other by a spring 16, and are configured to integrally rotate clockwise due to contact at portions 17a and 15c. 17a and 15c may be shaped like claws as shown in FIG.

From the state shown in Figure 9, the coil is energized (re-energized).
As in Example 1.2, the rotating disk rotates counterclockwise. At this time, the sheet number plate 17 also rotates counterclockwise together with the rotary disk against the biasing force of the spring 22 due to direct contact or claw connection, thereby displaying the number of frames on the film. When the camera finishes shooting and opens the back cover, the reset lever 18 pushes down the rotary disk 15, which releases the connection between the number plate 17 and the rotary disk 15, and the number plate 17 rotates counterclockwise due to the biasing force of the spring 22 until it reaches the stopper. 23, stops and returns to the initial position.

〔Effect of the invention〕

As explained above, according to the present invention, the reciprocating motion of an electromagnetic drive member such as a plunger is converted into a rotary motion, and thereby the film is intermittently fed through several discs of film. This increases flexibility in the position of the counter and allows the counter to be placed in the dead space of the camera, helping to make it more compact. Also,
Various designs are also possible. Furthermore, since expensive parts such as a liquid crystal counter and complicated drive circuits are not required, the cost does not increase.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of the first embodiment of the present invention when no current is applied;
The figure is a detailed view of the cam portion of the first embodiment of the present invention when not energized, FIG. 3 is a longitudinal cross-sectional view of the first embodiment of the present invention when energized, and FIG. 4 is the cam portion of the first embodiment of the present invention when energized. 5 is a top view of the first embodiment of the present invention, FIG. 6 is a longitudinal sectional view of the second embodiment of the present invention, and FIG. 7 is a B-B of the second embodiment of the present invention. B sectional view, FIG. 8 is a C-〇 sectional view of the second embodiment of the present invention, and FIG. 9 is a vertical sectional view of the third embodiment of the present invention, the first
Figure 0 is a detailed view of the reset lever part of the third embodiment of the present invention, Figure 11 is a top view of the number cover part of the third embodiment of the present invention, and Figure 11 is a top view of the number cover part of the third embodiment of the present invention.
FIG. 2 is a detailed view of the contact portion of several rotating disks according to the third embodiment of the present invention. 1... Winding wire 2... Bobbin 3... Yoke 4... Fixed yoke 5... Plunger 6... Compression spring 7... Rotating member 8... Step screw 9... Ring-shaped member 10... Number board 11... Main plate I2... Photo interrupter 13... Piece number display arrow 14... One-way clutch member 15... Rotating disk 16... Compression spring 17... ... Number of discs 18 ... Reset lever 19 ... Spring 20 ... Stopper 21 ... Back cover 22 ... Spring 23 ... Stopper 3rd flash Fig. 4 Fig. 5 C Fig. 6' 2 5C ~

Claims (1)

[Claims] An electromagnetic drive means consisting of a conductive wire coil and an electromagnetic drive member that reciprocates; a ring-shaped member that is coaxial with the conductor coil and has serrated cams at two locations around the entire circumference; and an electromagnetic drive means that reciprocates integrally with the electromagnetic drive member. There is a rotating member that moves and rotates by alternately contacting the cam by reciprocating motion, and a number board that displays the number of frames on the film by rotating itself, and the number board is driven by the rotating member. Characteristic film counter device.