JPS58200222A - Camera equipped with lens protecting cover - Google Patents

Abstract

PURPOSE:To reduce the eclipse of a photographic optical path due to an opening/closing plate which is stopped halfway, by engaging and disengaging a shorter arm of a lever having two, longer and shorter arms and an acting part of a camera to open the opening/closing plate just before a protecting cover reaches a photographic position and shortening the operation period of the opening/closing plate. CONSTITUTION:A shorter arm 22b of a two-arm lever 22 is engaged with a projection 18d of a baseboard 18 just before the photographic position, and is turned clockwise in accordance with the movement to the photographic position, and an opening/closing plate 15 is evacuated from an aperture 9a through a standing pin 15a by a longer arm 22a having a high shake ratio and is pressed to a lower open position. When a protecting cover 9 reaches the photographic position, the shorter arm 22b of the lever 22 engaged with the projection 18d of the baseboard 18 is deflected, and the opening/closing plate 15 is pressed to the open position elastically. Thus, front faces of a photographic lens 10 and a window 14 for photometry are opened through the aperture 9a of the protecting cover 9 and an aperture 9b for photometry.

Description

Detailed Description of the Invention Technical Field The present invention provides a method in which a protective cover having an opening for transmitting photographing light moves in a plane perpendicular to its optical axis on the front surface of a photographing lens of a camera, so that the aperture is exposed to the front surface of the photographing lens. If you let me leave, I'll share the number with you.
The present invention relates to a camera whose opening is opened and closed by an opening/closing plate that is linked to the movement of a protective cover.

Prior Art Such a turtle is disclosed in, for example, Utility Model Application Publication No. 56-139130.
Since there is no need to move the entire protective cover in front of the photographic lens, the protective cover can be opened wide, increasing the degree of freedom in camera design. Since it can be closed when the camera is evacuated from the camera, dustproofing is guaranteed when the camera is not in use. However, in conventional cameras of this type, the protective cover and the opening/closing plate are always linked, and the position of the opening/closing plate is determined in proportion to the amount of movement of the protective cover. Therefore, if a photographing operation is performed before the protective cover has completely reached the photographing position, the photographing optical path may be obscured by the opening/closing plate. The lighter the degree of vignetting, the less noticeable it is. In addition, if you inadvertently move the protective cover toward the shielding position, that is, the opening/closing plate closed position while placing your finger in the opening, the force applied to the protective cover will be applied to your finger via the opening/closing plate, causing your finger to become There is also the risk of getting caught and damaging the opening/closing plate and the interlocking mechanism between it and the protective cover.

Purpose An object of the present invention is to provide a camera with a protective cover that does not have such drawbacks.

Embodiment FIGS. 1 and 2 are front views of a camera (1) embodying the present invention, showing the state in which the protective cover (9) is in the shielding position and the photographing position. The camera (1) is an automatic focusing/lens shutter camera with a built-in flash, and like known cameras, it has a shirt release button (2), a winding lever (3), a rewind button (7 knobs), and a flash light emitting section (5
), photographic lens (10-person distance measurement window (11), (12)
, a finder window (13), etc. (6) is a flash operation member, which is slidably provided on the camera (1). At the AE position shown in the figure, the flash is powered off and daylight photography is performed, and at the FM position. When switched to , the flash power is turned on and the exposure control mechanism in the camera is switched so that the aperture is controlled according to the measured distance value (so-called flashmatic). (7
) is a film sensitivity setting dial, the setting value of which is displayed on the sensitivity display window (8). (14) is a photometric window for guiding light from a subject to a photometric element for automatic exposure control, into which a photometric light receiving lens is fitted.

(9) is a protective cover according to the present invention, which is equipped with an aperture (9a) for introducing photographic light and an aperture (9b) for photometry. (15) is an opening/closing plate that opens and closes the opening (9a), and as will be described in detail later, the opening/closing plate (15) opens and closes the opening (9a) just before the protective cover (9) reaches the photographing position shown in FIG. (9a) is opened, and when the protective cover (9) begins to retreat from the photographing position, the opening (9a) is closed.

In the shielding position shown in FIG.
2) and the finder window (13), the photometric light-receiving lens (14) has an opening/closing plate (9a) that closes the opening (9a).
15). On the other hand, the film sensitivity setting member (7) and the sensitivity display window (8) are not covered and are in a state where the film sensitivity can be set prior to use of the camera.

In the photographing position shown in Fig. 2, by retracting the protective cover (9), the distance measuring light receiving windows (11), (12) and the finder (13) appear, and the photographing lens (10) and the metering window (14) are removed. On the front of each lens aperture window (9a
) and the photometric aperture (9b) face each other, and the aperture (9a
), the opening/closing plate (15) appears by retracting downward. On the other hand, the film sensitivity setting member (7) and the sensitivity display window (8) are covered by a protective cover (9), and the film sensitivity setting member (7), which has been set in advance, may be inadvertently removed prior to shooting. It is broken 4 times so that it cannot be operated.

FIG. 3 shows a partially sectional side view of the camera (1) when the protective cover (9) is in the lower shooting position.

As shown in the figure, a transparent member (16) made of acrylic or the like is fitted into the photometric aperture (9b) to seal the transparent aperture [7]. In addition, the lower end (9C) of the protective cover (9) is attached to the camera (1
) so that it does not reach the bottom (1a) of the camera (1a).
) on the floor (17), the protective cover may be accidentally removed.
(The design has been taken so that 91 does not move upward. (18) is a plywood board that is integrated with the camera (1), and has a sensitivity display window (8) and a through hole for photometry (18b). , a photographic plate light aperture (18c), etc. are formed.The illustration after opening and closing is omitted in this figure.

FIGS. 4 and 5 show the protective cover (9) and related components when the protective cover (9) is in the shielding position and the photographing position, corresponding to FIGS. 1 and 2. The mechanism is shown from inside the camera. In Figure 4, which shows the protective cover (9) in the upper shielding position, the plywood (18)
The left and right wing parts (18e) (18f) (approximately three feet above D)
In the figure, the 6-2/2 part falls perpendicularly to the plane of the paper to form a stepped part, and then falls a short distance inward in the direction perpendicular to the plane of the paper, and then connects at the lower center (18i), forming a step at the lower center (18i). A protrusion (18j) is formed upward from 18i). This protrusion (18j) is formed with an opening (ISC) for introducing subject light and a photometric through hole (18b). A film sensitivity display window (8) is also formed at the lower center (18i). The plywood (18) has both supporting parts (18a) fitted into the guide grooves (9d), so that
The protective cover (9) is supported movably in the vertical direction, and when the protective cover (9) is in the rest position, the click groove (
It is locked in that position by a click spring (19) that engages with 9e). The opening/closing plate (15) has a protective cover (
a mounting plate (20) that is fitted into a guide groove (9f) provided on the inner wall surface of the mounting plate (9) and fixed to both sides 11 thereof;
21) so as to be movable up and down. Further, the opening/closing plate (15) is connected to the swinging end (22a) of the interlocking member (22) via its implant pin (15a), and the interlocking member (
22) is rotatably supported on a shaft (23) on the protective cover (9), and is biased counterclockwise by a spring (24), so that the opening/closing plate (15) is normally opened ( 9
A biasing force is applied in the direction of closing a). In FIG. 4, the opening/closing plate (15) is in a closed position facing the opening (9a) and closes the opening (9a), while FfiI
It is in a closed state facing the photometric light receiving window (18b) of the front base plate (18) which is opposed to the photometric window (14). Further, a protective cover (9) faces and closes a lens frame (18C) made of plywood (18) that is placed opposite to the front surface of the photographic lens (10).

As mentioned above, when the protective cover (9) is in its rest position, the automatic focusing device d shown by FIG.
, and a switch contact piece (25) for the power switch (25) of the electric circuit in the camera (1) such as an automatic exposure control device.
5a) climbs onto the inner wall frame (9g) of the lens protection cover (9) and touches the mating switch contact piece (25b)'
The power supply is opened. Also switch (
26) is also provided as one of the power switches of the flash device, and is opened when the protective cover (9) is closed, and the power is cut off.

FIG. 5 corresponds to FIG. 2, and the protective cup < -(9
) is in the lower shooting position. At this time,
The protective cover (9) has its guide groove (9d) made of plywood (18
) spring (19) engages with the click groove (9h) and is locked. In this photographing position, the opening (9a) of the protective cover (9) and the photometric opening (9b) face the front surfaces of the lens frame (18c) and the photometric through hole (18b) of the plywood (18), respectively.

On the other hand, just before reaching the photographing position during the moving process, the passive end (22b) of the interlocking member (22)
18d), and rotates clockwise in conjunction with the movement from there to the photographing position, and from the swinging end (22a) with a larger swinging ratio than this shaft, via the planting pin (15a). The opening/closing plate (15) is retracted from the opening (9a) and pushed downward to the open position. And when the protective force/<-(9) reaches the photographing position stand, the protrusion (18) of the plywood (18)
the passive end (22b) of the interlocking member (22) that engages with the
) is composed of an elastic piece having appropriate elasticity, so that it bends slightly elastically, thereby elastically pressing the opening/closing plate (15) to its open position. With this, as shown in Fig. 2, the front surface of the photographing lens (10) and the photometry window (14) are opened through the opening (9a) of the protective cover (9) and the photometry aperture (9b). . On the other hand, when the protective cover (9) is in the photographing position, the switch contact piece (25a) also acts as a click spring, and the click groove (
91), the other switch contact piece (
25b) and the power supply of the camera's electrical circuit is closed. Further, the switch (26) is also closed by a protrusion (9j) provided on the inner wall surface of the protective cover (9), and the power switch (27) of the flash device, which is separately opened and closed manually as shown in Fig. 8, is closed. It is prepared so that its power is turned on by the configuration.

FIG. 6 shows another embodiment of a mechanism for opening and closing a power switch (25) of a camera such as an automatic focus adjustment device and an automatic exposure control device, or a power switch (27) of a flash device. In particular, in order to link the operation of the opening/closing plate (15), the opening/closing plate (15) and the interlocking member (22
) is provided with a switch (28) that is opened and closed by an implanted pin (15a) that is connected to the main body.

FIG. 7 shows the film sensitivity setting mechanism. The film sensitivity setting member (7) is attached to the auxiliary base plate (29) installed inside the camera.
) is rotatably supported by the implant pin (29a), and the gear part (7a) on its outer periphery is meshed with the gear part (30a) of the light-receiving part diaphragm plate (30). Aperture plate for light receiving section (
30) is fitted onto the outer periphery of the photographic lens barrel (31) so as to be rotatable around the optical axis of the photographic lens, and is fitted into the aperture (31a) of the photographic lens barrel (31) for photometry. Light-receiving lens (14) and film sensitivity display aperture (31)
b), apertures (30b
) and <7. It has a scale (30c) for displaying film sensitivity. When setting the film sensitivity, as shown in Figure 1, when the lens protection cover (9) is in the upper closed position, the film sensitivity setting member (7) appears, and in this state, the film sensitivity setting member (7) appears. This is done by operating the sensitivity setting member (7) and setting the film sensitivity display scale (30c) visually recognized from the film sensitivity display window (8) in accordance with the film sensitivity to be used.

FIG. 8 is a simplified diagram of an electric circuit applied to the camera of this embodiment. (32) is an automatic focus adjustment circuit, (33) is an automatic exposure control circuit, (34) is an automatic exposure control circuit (33)
It is an electromagnet that is controlled by the automatic exposure control circuit (33), and is excited when the power is turned on to the automatic exposure control circuit (33), and the excitation at this time activates the release of the automatic focus adjustment device and automatic exposure control device. It functions as a so-called shutter control electromagnet that starts the closing operation of the shutter device by functioning and then being deenergized. (35) is a battery check circuit, (36) is a flash circuit including a flash discharge tube and its power supply/trigger circuit, and (37) is a shutter connected in line, and when both switches (37) and (25) are closed, A power source (38) is connected to the autofocus port/path (32), the autoexposure control circuit (33), and the battery check circuit (35).

Switch (27) and switch (27) interlocked with this
') is a changeover switch that is linked to the AEi"M switching member (6), which is manually operated to select between natural light photography and flash photography. When connected to the terminal (AE), the flash circuit (36) is switched (27”) by opening the power supply (3
8) connection is severed. On the other hand, the automatic exposure control circuit (3
3) demagnetizes the electromagnet (34) with an exposure time depending on the brightness of the subject and activates the shutter closing operation. Furthermore, when connected to the terminal (FM), the flash circuit (36) is activated by closing the switch (27').
) and when the protective cover (9) is in its photographing position, the switch (26) is closed and the flash circuit (36) is enabled to operate, while the automatic exposure control circuit ( 33) controls the electromagnet (34) with a predetermined exposure time 13- corresponding to flash photography.

In addition, the battery check circuit (36) is connected to the power supply (38)
The automatic exposure control circuit (33) is controlled based on the detection signal at this time, so that the electromagnet (34) cannot be forcibly excited. That is, as a result, the electromagnet (34) which also functions as an electromagnet for electromagnetic release cannot be excited, so that the release operation is not performed at a voltage lower than the specified voltage.

Effects According to the present invention as described above, the opening and closing plate is opened just before the protective cover reaches the photographing position by the engagement and disengagement between the short arm of the lever having two long and short arms and the operating part of the camera. Even if such a situation were to occur with the opening/closing plate because the operating period is short, the movement of the opening/closing plate would appear as a greatly amplified movement of the protective cover, so it would be easy to notice. In addition, the opening/closing plate is closed by the biasing force of the spring, and the operating force applied to the protective cover is not applied to the opening/closing plate, so the protective cover cannot be moved to the shielding position with the finger inserted in the opening of the protective cover. However, the only force applied to your fingers is the biasing force of the spring, so your fingers will not be hurt or the camera mechanism will not be damaged.

[Brief explanation of the drawing]

1 and 2 are front views of a camera implementing the present invention,
Fig. 3 is a partially sectional side view of the same camera, Figs. 4 and 5 are rear views of essential parts of the protective cover and related parts of the embodiment of the present invention, and Fig. 6 is the part shown in Figs. A rear view of the main parts showing a modification example, and Figure 7 is a front view and cross-sectional view of the film sensitivity setting section.
FIG. 8 is a circuit diagram showing an example of a circuit operated by the mechanism of the above embodiment. camera, 9: protective cover, 10: photographic lens, 15:
Opening/closing plate, 11/12; Rangefinder window, 13': Finder window,
14: Photometry window, 7: Film ('>shi, mu sensitivity setting member, 2
2: Two-arm lever, 18d: Action part. Applicant: Minolta Camera Co., Ltd. 15- Figure 5 Figure 6 Figure 18! 1FtL 78mmFigure 7Figure 8

Claims (1)

[Claims] 1. At least an aperture of a size that does not interfere with the photographing light beam is formed, and the aperture is retracted from the front surface of the photographing lens at the photographing position where the aperture is located in front of the photographing lens, and the shielding portion covers the front surface of the photographing lens. a protective cover that is movable in a plane perpendicular to the imaging optical axis between a shielding position that covers the camera, and a closed position that closes an opening of the protective cover and an open position that opens the opening; The opening/closing plate, which is biased in the direction of The camera is equipped with an operating member that acts on the short arm of the two-arm lever just before moving the opening/closing plate from the closed position to the open position. 2. The camera according to claim 1, wherein the opening/closing plate and the two-arm lever are provided on the protective cover, and the operating member is fixed to the camera body. a The two-arm lever is made of a leaf spring, and the operating member is a protrusion formed on the camera, and when the two engage each other [7]
3. The camera according to claim 2, wherein the short arm of the two-arm lever is elastically deformed.