JPS60140220A - Camera incorporating motor - Google Patents

Abstract

PURPOSE:To stop down a lens right before photography and to open it after the photography through simple constitution with high precision by rotating a cam member only in one direction by an internal motor. CONSTITUTION:A nonreturn pawl member 8 which engages an idle gear 7 is provided as a clutch mechanism which transmits the rotation of the motor 1 to a stop driving cam 13, and when a shutter button is pressed and the motor 1 rotates as shown by an arrow (a), the stop driving cam 13 rotates as shown by an arrow (a) through the idle gear 7 and a rotation transmitting gear 12 and a stop- down member 14 is turned through a sliding contact pin 18 to stop down the lens. When the motor 1 rotates forward as shown by the arrow (a) with a signal from a control circuit after photography, the stop driving cam 13 rotates as shown by the arrow (a) through a rotation transmitting mechanism and further rotates as shown by the arrow (a) from the position where a proper stop value is obtained firstly, so that the lens stop mechanism is reset to the initial state.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a camera with a built-in motor, and more particularly, to a camera in which a motor for driving an aperture, a mirror, etc. is built into the camera body.

(Prior art) For example, there is a camera (Japanese Patent Application Laid-open No. 74419/1983) which uses a spring drive to narrow down the aperture, and uses a built-in device to charge the spring and open the aperture. Since the above-mentioned aperture is driven by a spring, the aperture lever must be locked by a magnet or the like at a predetermined aperture value, and a notched gear must be used to disengage the gear when the aperture is narrowed. However, it has the disadvantage that it is extremely complicated and expensive.

Also known is a device in which the aperture lever is driven by a built-in motor and the aperture lever is locked using the repulsion of a magnet (Japanese Patent Laid-Open No. 55-98732), but this is also known. Since it uses a magnet, it has the disadvantage that the mechanism is extremely complicated and expensive, as in the case of the conventional camera mentioned above, such as the need to attract the locking lever with the same magnet when driving the aperture lever. was.

(Purpose) In view of the above points, the present invention skillfully uses a cam member that rotates in only one direction between the lens opening 2L) immediately before photographing and the opening at the end of engraving. Accordingly, it is an object of the present invention to provide a camera with a built-in motor that has an extremely simple structure and can perform a lens focusing operation with high precision.

(Summary) The camera with a built-in motor of the present invention is provided with a cam member that is allowed to rotate in only one direction by the built-in motor, and the diaphragm is operated to and from the aperture position by rotating the cam member in only one direction. It is characterized in that it operates to an initial open position.

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

FIG. 1 is an exploded perspective view of a main part of a camera with a built-in shutter showing an embodiment of the present invention. This camera is a 7-lens camera, and the motor 1 for driving the aperture and the like is located below the main movable mirror 29 of the camera. In the figure, reference numeral 2 is a drive gear integrally attached to the output shaft extending outward from the motor 1, 3 is a reduction intermediate gear meshing with the drive gear 2, and 4 is coaxial with the intermediate gear 3. A sun gear that is integrally attached and constitutes a planetary gear mechanism together with a planetary gear 6 and an arm 5, and 6 is an arm 5.
7 is an idle gear that meshes with the planetary gear 6; 8 is engaged with the idle gear 7 and allows rotation of the gear 7 only in the direction of arrow a; This is a non-return pawl member that prevents reverse rotation, and is swingably supported by a fixed shaft 11, wound around the same shaft 11, and having both ends connected to one side edge of the non-return claw member 8 and the fixed pin 1.
The torsion spring 9, which is set to 0, is biased toward the tooth surface of the idle gear 7. Reference numeral 12 denotes a rotation transmission gear that meshes with the idle gear 7, and a disc-shaped aperture drive cam 13 is integrally connected to the gear 12 eccentrically and coaxially. Reference numeral 14 denotes an arm-shaped aperture member whose base end is swingably supported by an immovable support shaft 15 and whose distal end engages with an aperture lever 37 on the side of the lens barrel. A sliding pin 18 is implanted to contact the surface of the cam member 130. The narrowing member 14 is wound around an immovable support shaft 15, one end of which is bent over the upper surface of the member 14, and the other end of which is hooked onto an immovable pin 17K. It is urged to come into pressure contact with the curved surface, which is the operating cam surface of the cam member 13. Reference numeral 19.20 indicates the sliding contact bottle 18.
is moved to the lowest and highest position (bottom dead center,
This is a normally open leaf switch that closes when the vehicle reaches top dead center. Reference numeral 21 designates an idle gear with which the planetary gear 6 revolves and meshes when the motor 1 rotates in reverse, that is, in the direction indicated by the arrow. Drive cam 2
Gear 25 in which 6 is attached eccentrically and coaxially
It is intended to be transmitted to 28 is the main movable Mi 2-2
4-2, which is implanted on one side of the rotation shaft 31 on one side of the mirror drive shaft 31, and whose tip abuts against the surface of the mirror drive cam 26;
-27 is provided for the sea drive pin. The main movable mirror 29 is wound around its pivot shaft 31, and is normally held in the lowered state shown in the figure by a torsion spring 32, which has one end attached to an immovable pin 33 and the other end attached to the mirror drive pin 28. It is biased so that 34 and 35 are normally open leaf switches that are opened and closed by the vertical movement of the mirror drive pin 28, respectively, and are closed when the pin 28 and the mirror drive cam 26 are at the bottom dead center position and the top dead center position, respectively. It is now possible to Reference numeral 30 denotes a well-known total reflection mirror disposed on the back side of the light-transmitting part of the main movable mirror 29, which reflects the light that has passed through the photographing lens and lens aperture (not shown) onto the bottom wall of the mirror box. The light is received by a well-known photometric photoelectric conversion element 36 provided therein. 3
Reference numeral 7 denotes a lens diaphragm lever that operates the diaphragm in the lens barrel, and the lower surface of its connecting portion (the right end in terms of rotational pressure) is in contact with the upper surface of the near-bent portion of the tip of the diaphragm member 14. By rotating clockwise, the aperture lever 37
is rotated counterclockwise to narrow down the aperture inside the lens barrel. This aperture lever 37 is given a clockwise rotational habit by a tensile coil spring 38 that is applied to the right end of the lever and to a stationary member, so that the lever 37 is rotated around the aperture member 14.
It is designed to oscillate due to the

Next, the operation of the camera with a built-in heptad of the present invention constructed as described above will be explained using FIGS. 1 to 3 and FIG. 5.

First, when a shutter button (not shown) is pressed, the motor 1 starts and rotates in the direction of arrow a.

Then, as shown in FIG. Intermediate gear 3. Sun gear 4. Planetary gear 6, idle gear 7,
The aperture drive cam 16 is connected to the aperture drive cam 16 via the rotation transmission gear 12.
rotates in the direction of arrow a. As the cam 13 rotates in the direction of arrow a from the initial position shown (bottom dead center position) where its operating cam surface is in contact with the sliding pin 18 at its lowest position, The eyepiece 18 is pushed up and the aperture member 14 is rotated clockwise, thereby the aperture lever 37 is rotated counterclockwise to perform lens aperture. Then, the light is measured by the photoelectric conversion element 36, and the appropriate exposure aperture value is reached based on the photometric value, which is further compared with the signal from the detection means by the comparison circuit as shown in FIG. Once confirmed, the motor 1 is stopped by an electromagnetic brake (not shown). At this time, the restoring elasticity of the coil spring 38 and the torsion spring 16 acts to push down the aperture driving cam 16 via the sliding pin 18 and rotate it counterclockwise. Since the idle gear 7, in which the gear 12 integral with the cam 13 is meshed, is checked by the non-return claw member 8, the cam 13 is fixed and the aperture value is stable.

Next, when the above-mentioned narrowing down operation is completed, the motor 1 rotates in the reverse direction in the direction of the arrow mark based on a signal from the control circuit (see FIG. 5). Then, the drive gear 2. intermediate gear 6
, the sun gear 4 also rotates in the direction indicated by the arrow, and the planetary gear 6 rotates on its own axis and revolves around the sun gear 4, meshing with the idle gear 21, rotating the gear 21 in the direction indicated by the arrow, and transmitting rotation. The mirror drive cam 26 is rotated in the direction indicated by the arrow through the gears 23, 24, and 25. The cam 26 has an operating position a- at the upper end of its operating cam surface.
The pin 28 is brought into contact with the pin 227 of the mirror drive pin 28 at the position shown in FIG. (top dead center position) against the elasticity of the torsion spring 32, the main movable mirror 29 and the total reflection mirror 2-
30 is rotated to a horizontal position and retracted out of the photographing optical path.

Then, when the mirror drive pin 28 reaches the top dead center position, the leaf switch 35 is closed by the mirror drive pin 28, and an electromagnetic brake (not shown) in the switch circuit is operated, and the Tanabata 1 stops.

Next, the shutter base moves according to the release operation of the shutter, and when the exposure to the film is completely completed, the shutter is released.
The mirror 1 rotates again in the same direction, that is, in the direction indicated by the arrow, based on a signal from the control circuit, and the mirror drive cam 26 is rotated half a rotation in the direction indicated by the arrow as before. Then, the mirror drive bin 28 also descends to the initial position of the bottom dead center position, and the main movable mirror 29 and the total reflection mirror 30 descend and return to the initial positions shown. When the lowered pin 28 closes the switch 34, an electromagnetic brake (not shown) in the switch circuit is actuated and the motor immediately stops.

Next, the motor 1 rotates forward in the direction of arrow a based on a signal from the control circuit. Then, the planetary gear 6 of the cruising gear mechanism switches, and the aperture drive cam 13 rotates in the direction of arrow a via the rotation transmission mechanism described above, further moving in the direction of arrow a from the position where the proper aperture value was reached first. It rotates and reaches the above-mentioned top dead center position, which is the temperature bottom dead center position where the minimum aperture value is achieved. Then, the sliding pin 18 closes the leaf switch 19, an electromagnetic brake (not shown) in the switch circuit is activated, the motor 1 is stopped, and the motor 1 returns to the initial state shown in FIG.

FIG. 2 shows the motor 1. Squeezing member 14. Main movable mirror 29. Total reflection mirror 30. Switch 19.20゜5
4.55, in which T1 is the sidelight/calculation time, T2 is the shutter opening/closing time, and T
, indicates the shutter charge and film winding time, respectively. Note that as soon as the aperture value reaches a predetermined value, a reverse voltage is applied to the motor 1, and the main movable mirror 29. After raising the total reflection mirror 30 and completing the shooting, the same mini 7-2q
, so, and then apply a reverse voltage to the motor 1 to cause it to rotate in the forward direction, thereby returning the °C lens diaphragm mechanism to its initial state in the same way.

Next, when photographing a highly bright subject or using high-sensitivity film, if the aperture is still insufficient even after reducing the aperture value to the minimum aperture value, set the minimum aperture value as shown in Figure 3. When the aperture is stopped down, that is, when the sliding pin 18 reaches the top dead center position, the leaf switch 20 is closed by the pin 18, thereby stopping the motor 1 and photographing is performed at the minimum aperture value. At this time, the exposure amount for the above-mentioned minimum aperture value is recalculated, the shutter speed is determined and the shutter is run, or the TTL direct metering method that calculates the shutter speed during film exposure is used for four-gram photography or shutter speed priority. In order to obtain an appropriate amount of exposure during photographing, the shutter speed is corrected by the signal from the switch 20 only when the minimum aperture value is 1.

FIG. 4(A) is an exploded perspective view of a main part of a can 2 with a built-in motor showing another embodiment of the present invention. This Tanabata built-in camera has the same structure as the Tanabata built-in camera shown in FIG.
The explanation will be omitted. The clutch mechanism in this embodiment is different from that in which the clutch mechanism using the non-return claw of the camera shown in FIG. Stopper member 8
The difference is that an idle gear 7A incorporating a one-way clutch using rollers is used instead. As shown in FIG. 4(B), the idle gear 7A is fitted into a disc-shaped fixing member 40 coaxially integrated with the fixed shaft 39.

This fixing member 40 has a plurality of pieces (two pieces in this case) on the surface.
Wedge-shaped inclined notches 43 are provided at equal intervals, and inside the notches 43 are rotatable and movable rollers 41 and coil springs 42 for pressing the rollers 41 against the narrow side of the notches 43. There is an intervention. When the seven idle gears arranged in this way rotate in the direction of arrow C, the
A41 receives a force in the direction of compressing the coil spring 42, compresses the coil spring 42, and moves to the wide gap side, so it can rotate freely, but as shown in FIG. 4(C), it rotates in the direction of arrow d. When doing so, the coil spring 42 presses the roller 41 against the narrow gap side, and the frictional force of the roller 41 prevents rotation. That is, the idle gear 7A is equipped with a one-way clutch mechanism that is allowed to rotate only in the direction of arrow C. Therefore, it functions in exactly the same way as the idle gear 7 in FIG. Even when the clutch mechanism is stopped at an intermediate position of the fringes as shown in FIG. 2, it operates in exactly the same way as the clutch mechanism shown in FIG. 1, and does not cause fluctuations in the aperture value.

Note that the clutch mechanism includes the idle gear 7.7.
A, but also other gears, such as gear 12.
Of course, other known clutch mechanisms may be used as appropriate. In addition, in the above embodiment, contact type leaf switches were used for the switches 19, 20, 34 and 35, but these can detect the position without contact.
For example, using a phototorra/sister or the like, the narrowing member 14. Movable mirror 29.50 (cam members 15, 26
, gear 12.25 is also possible), etc., of course.

Further, in the case of a general V5-type, when the load is constant, the rotational speed gradually increases immediately after the start of rotational driving, and reaches a steady rotational speed after a certain period of time. Therefore, the above-mentioned narrowing member 1
When using a lens in which the amount of movement in step 4 and the amount of change in the aperture aperture are linear or have a fixed relationship, by designing the aperture aperture so that the rate of change is constant, all aperture apertures of the same lens can be adjusted. It can be controlled with high precision. In this regard, in the present invention, since the aperture drive cam 13 is used to reciprocate the aperture member 14, the cam is designed to take into account the change in rotational speed when the motor 1 starts driving. The aperture diameter can be changed at a constant speed, and the aperture can be easily controlled with high precision.

(Effects) As explained above, according to the Kinei 8AK, ■The lens is narrowed down and opened by rotation of the motor in the same direction, and a clutch mechanism is cleverly provided, so it is different from the conventional one. It is no longer necessary to provide a magnet or the like to lock the narrowing member in a predetermined position, and the mechanism and electric circuit have become extremely simple. ■Since the reverse rotation of the motor can be used for other drives such as mirror drive, the mechanism is simpler than conventional cameras that have a single motor for switching means and drive the lens diaphragm and mirror. , and has become an inexpensive and reliable camera. ■Since a cam is used for the reciprocating movement of the aperture member, even when using Tanabata, where the rotation speed changes at the start of rotation, the cam shape is skillfully designed to maintain a constant speed that is easiest to control the aperture lever. By doing so, it is possible to provide a camera with a built-in lens diaphragm having extremely remarkable effects such as a highly accurate lens diaphragm mechanism.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of essential parts of a camera with a built-in motor showing an embodiment of the present invention. FIG. 3 is a time chart showing the operating steps of the camera with built-in Tanabata shown in FIG. , FIGS. 4(B) and 4(C) are block diagrams of the motor inner path of FIG. 4(A). 1... Motor 8... Non-return claw member (rotation direction regulating means) 13...
...Aperture drive cam (cam member) 14...-Prefectural aperture member 37...Aperture lever procedural amendment (voluntary) February 77, 1981 Case 1 Indication of 1981 Patent Application No. 251981 2 ,
Title of the invention Motor-built-in camera 6, relationship with the case of the person making the correction Patent applicant location 2-43-2 Hatagaya, Shibuya-ku, Tokyo Name Name
(037) Olympus Optical Industry Co., Ltd. 4, Agent
Person (324-2700) '-5, amended as per the subject of correction. (2) “Total reflection mirror 2-
'' Next to ``(reflector diffuser board)'', add 0 (3) Next to ``evacuate'' written in line 6 on page 9, add ``total reflection mini y-50''. Although not shown, the means for retracting the main movable mirror 2ν out of the photographing optical path is a well-known means that moves it out of the photographing optical path in conjunction with the movement of the main movable mirror 2ν so as to follow and overlap with the main movable mirror 29. will join. Attachment ``2 Claims A cam member rotated by a built-in motor, and a diaphragm member that drives an aperture lever of a lens in conjunction with the cam member. Rotational direction regulation that allows the cam member to rotate in only one direction.'' means and

Claims (1)

[Scope of Claims] A cam member rotated by a built-in motor, an aperture member that drives an aperture lever of a lens in conjunction with the cam member, and a rotation direction regulating means that allows the cam member to rotate in only one direction. A camera with a built-in motor, characterized in that, by rotating the cam member in only one direction, the aperture is operated from an open position to a predetermined aperture position, and from the same aperture position to an initial open position after photographing. .