JPH0882850A - Light shielding structure of camera - Google Patents

Abstract

PURPOSE: To make a camera compact by providing the light shielding structure of cutting off incident light which having a fear of exposing a film while passing through an opening for a contact piece into which a detecting contact piece for detecting a DX code is inserted, without increasing the dimension of the camera in its forward and backward directions. CONSTITUTION: The camera is constituted in such a manner that a lens barrel unit 3 is arranged in adjacent to a cartridge chamber P in which a cartridge C housing a roll of film and having an information display part such as a DX mark is loaded, the detecting contact piece 17 provided with a contact part 17b capable of coming into contact with the information display part is disposed on the outside surface of a cartridge chamber cover 2c and further, the opening for the contact piece 24 into which the contact part 17b of the detecting contact piece 17 is inserted from the outside is formed on the cover 2c. Further, a light shielding member 18b covering the outside of the opening for the contact piece 24 is arranged in a part of the fixed barrel 18 of the lens barrel unit 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-shielding structure near a camera chamber of a camera.

[0002]

2. Description of the Related Art As one direction for popularization of cameras, miniaturization of the cameras is desired, and various compact cameras have been developed and put into practical use. In such a background, there is also known an ultra-small camera in which a film used for shooting is a special small film, but when the film becomes small, the resolution of the image is deteriorated, and a sharp photograph cannot be obtained. Since such a special film is not widely used, it is difficult to obtain it when necessary.

Therefore, there is a demand for the development of a compact camera which uses a roll film housed in an ordinary cartridge and has a size as small as possible.

As a recent compact camera,
In order to simplify the shooting and to obtain higher functionality, a DX mark is provided at a predetermined position on the outer surface of the patrone that houses the roll film, and the DX code is read by contacting the DX mark in the patrone chamber of the camera, There is known a technique of disposing a detection contact piece for detecting information such as film sensitivity of a roll film housed in a cartridge.

The detection contact piece is disposed on the outer surface of a cartridge cover which constitutes the cartridge chamber, and its contact portion penetrates through the cartridge chamber cover and contacts the DX mark of the cartridge loaded inside. An opening for the detection contact piece is formed in this cartridge cover.

Since the contact piece opening is provided in the vicinity of the lens barrel on the front side of the camera, outside light incident from the peripheral portion of the lens barrel or the like passes through the opening and passes through the outer peripheral portion of the cartridge and then the cartridge. Since there is a risk of exposure to the roll film that is pulled out from the contact film, there is known a structure in which a light blocking member that is substantially parallel to the detection contact piece is provided to prevent intruding light from entering through the contact piece opening. Has been.

[0007]

However, if a light-shielding member is separately provided in parallel with the detection contact piece and attached to the patrone chamber cover, the size of the patrone chamber cover in the front-rear direction increases. This is an obstacle when trying to make the overall shape of the camera compact.

Specifically, as for the dimension of the camera in the front-rear direction, when the design target is set to the extent that the thickness of the cartridge cover of the cartridge and the thickness of the front and rear camera covers are added to the diameter of the cartridge. The interposition of the light shielding member has a problem that it directly causes an increase in the dimension in the front-rear direction.

Therefore, the present invention has been made in view of the above circumstances, and intruded light that may be exposed to the film through the opening for the detection contact piece without causing an increase in the size of the camera in the front-rear direction. It is an object of the present invention to provide a light-shielding structure for a camera, which shields the light source and realizes compactness.

[0010]

A camera of the present invention which achieves the above object is provided with a cartridge chamber in which a cartridge containing a roll film and having an information display portion such as a DX mark corresponding to the film sensitivity is loaded. A detection contact having a lens barrel unit holding a photographing optical system adjacent to the cartridge chamber and having a contact portion capable of contacting the information display portion on the outer surface of the cartridge chamber cover forming the cartridge chamber. And a contact piece opening through which the contact portion of the detection contact piece can be inserted from the outside to the inside, and a mirror arranged adjacent to the patrone chamber cover. A light-shielding member that covers the outside of the contact piece opening of the cartridge chamber cover is provided in a part of the fixed cylinder of the trunk unit.

Further, it is preferable that the light shielding member is formed so as to extend obliquely from the side of the fixed cylinder along the contact piece opening in a direction approaching the cover on the front side of the camera.

[0012]

According to the present invention, the contact portion of the detection contact piece comes into contact with the information display portion such as the DX mark of the cartridge loaded through the contact piece opening of the cartridge cover to detect information such as film sensitivity. External light that has entered the contact piece opening from the periphery of the lens barrel unit or the like is blocked by a light-shielding member provided in the fixed barrel of the lens barrel unit, so that the external light enters from the contact piece opening to the inside of the cartridge chamber. Is prevented from being exposed and the roll film pulled out from the cartridge is not exposed. Further, since the light shielding member is formed from the fixed barrel of the lens barrel unit, there is no component that overlaps in the front-back direction of the cartridge chamber cover, and the size of the camera in the front-back direction is not enlarged, and the camera can be made compact. It has a structure that allows it.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view in which a front cover and the like of a camera having a light shielding structure according to an embodiment are omitted.

The camera 1 of this embodiment is constructed by attaching various parts to a camera body 2 formed of plastic. The camera body 2 has a cylindrical portion 2a for holding a lens barrel unit 3 having a photographing optical system 4 (photographing lens) in the center, and a flat plate portion 2b around the cylindrical portion 2a is configured as an aperture. A substantially cylindrical cartridge chamber cover 2c that forms a cartridge chamber P therein is connected to one end of the camera body 2, and a substantially cylindrical spool chamber cover that forms a spool chamber S at the other end. 2d are connected.

A cartridge C (see FIG. 2) having a roll film accommodated inside the cartridge chamber cover 2c and a publicly known DX mark corresponding to the film sensitivity is attached to the outer surface is loaded inside the spool chamber cover 2d. The spool 10 of the film feeding mechanism 5 is inserted from above and installed.
The film feeding motor (not shown) 10 is built in to wind the roll film on the outer periphery of the spool 10.
A speed reduction mechanism 11 is installed on the upper part of 10. On the other hand, a rewinding fork 12 that engages with the shaft of the patrone C is inserted from above the patrone chamber cover 2c, and a gear train 13 is arranged from the rewinding fork 12 to the speed reduction mechanism 11 of the spool 10. It is set up. A horizontal shaft 13a is provided in the middle of the gear train 13.

The driving force of the film feeding motor in the spool 10 is decelerated by the speed reduction mechanism 11 and selectively transmitted to the spool 10 or the rewinding fork 12, and when transmitted to the spool 10, the driving force is applied to the spool 10. The film from the cartridge C is wound up, and when the film is transmitted to the rewinding fork 12, the film is rewound into the cartridge C. A claw mechanism 16 is installed on the bottom wall member 15 disposed at the bottom of the spool chamber cover 2d, and the claw mechanism 16 engages with the perforations at the tip of the roll film when the film is loaded. Has a function of winding around the spool 10.

A detection contact piece 17 for detecting the film sensitivity of the loaded cartridge C is provided on the outer surface of the cartridge cover 2c. This detection contact 17
The detailed structure of will be described later with reference to FIGS. 2 and 3.

In the lens barrel unit 3, the fixed barrel 18 is fixed to the barrel portion 2a of the camera body 2, and the movable barrel 19 is attached inside the fixed barrel 18 so as to be movable in the optical axis direction. The taking lens 4 is held in the cylinder 19.

A lens driving unit 21 (feeding motor) for driving the feeding movement of the moving barrel 19 is provided above the fixed barrel 18.
Is installed, and is configured to feed the movable barrel 19 along the guide shaft via a reduction gear (not shown). Further, a mask member 22 for switching the screen size is rotatably arranged on the cylindrical portion 2a of the camera body 2, and a light shielding frame 23 is arranged in front of it.

Further, the discharge tube 26 of the strobe device 6 is installed on the front surface above the cartridge chamber cover 2c of the camera body 2. A finger hook sensor 27 is attached to the discharge tube 26. A light emission control unit 28 of a strobe circuit is arranged near the discharge tube 26, and a main capacitor 30 for accumulating electric energy discharged by the discharge tube 26 is composed of two cylindrical capacitors. 30
Are arranged side by side in the optical axis direction in the side space between the lens barrel unit 3 and the spool chamber cover 2d.

On the other hand, the battery 31 as a power source is provided in the space below the lens barrel unit 3 with a wall portion 18a integral with the fixed barrel 18.
Is stored in the battery chamber formed by
The operating electric power is supplied to each drive unit by. A charge control unit 33 of a strobe circuit for storing required electric energy in the main capacitor 30 of the strobe device 6.
Is disposed in the space below the spool chamber cover 2d of the camera body 2 separately from the light emission control unit 28. Then, by the action of the charge control unit 33, the required electric energy is accumulated in the main capacitor 30 by using the battery 31 as a power source, and is loaded on both electrodes of the discharge tube 26, and the light emission control unit 28 connected to the discharge tube 26. The trigger circuit is short-circuited to emit light.

Further, a finger rest sensor 27 arranged in the vicinity (downward) of the discharge tube 26 detects the contact or approach of the photographer's finger, and the discharge tube 26 is held by the finger holding the camera 1. This is to warn that the opening of is blocked and the flash of light is blocked, and is provided in a structure for detecting from a change in capacitance, for example.

Above the lens barrel unit 3, a viewfinder section 7 in which an autofocus mechanism 34 and a viewfinder 35 are integrated is provided. For example, this finder unit 7 has an objective window 35 of the real image finder 35 at the center on the front side.
a is the projection lens of the autofocus mechanism 34 on both sides.
34a and a light receiving lens 34b are arranged.

The lens barrel unit 3 and the cartridge chamber cover
A part of the screen size switching mechanism 8 for switching the screen size between the normal size and the panorama size is provided in the lateral space between the 2c and the side space. That is, with respect to the mask member 22 arranged in the tubular portion 2a of the camera body 2, the upper and lower levers 37 and 38 which engage with the arm 22a formed at one end of the shaft thereof.
Is pivotally supported on the side surface of the fixed barrel 18 of the lens barrel unit 3,
An intermediate lever 39 is provided on the bottom surface of the finder portion 7 so as to be horizontally rotatable with respect to the levers 37 and 38, and a switching member 40 slidably supported by a camera cover (not shown) is attached to the intermediate lever 39. It is configured to work together.

The mask member 22 is rotated according to the operation of the switching member 40 to regulate the upper and lower sides of the exposure range of the photographing light to a panoramic size or open to perform normal size exposure. is there.

A back cover support portion 42 is provided at an end of the spool chamber cover 2d of the camera body 2, and a hinge member 43 of the back cover 9 is rotatably supported on the support portion 42. The back lid 9 is supported by a back lid body 44 made of a metal plate, a holding plate 45 for holding electronic circuit parts such as a date module (not shown), and a little movable in the optical axis direction with respect to the holding plate 45. ,
Aperture 2b of camera body 2 with film by spring
And a substantially rectangular pressure plate 46 that presses against.

The back cover main body 44 has a bottom surface portion 44a which covers the back surface of the camera main body 2 and a part of the bottom surface. Then, when the back cover 9 is opened, the bottom of the cartridge cover 2c opens to the bottom surface of the camera body 2, and
The bottom of the film passage from the cartridge chamber P to the spool chamber S is open, and the film cartridge C is loaded from the bottom of the film passage. The back cover 9
A notch is formed on the bottom surface 44a of the camera body along the battery cover (not shown) on the bottom surface of the camera body 2 so that the battery chamber can be opened without loading the back cover 9 even when the film is loaded.
Can be exchanged.

A flexible wiring board 47 for the electronic circuit parts is extended to the side of the holding plate 45 installed inside the back cover 9, and a flexible wiring board 50 for the main control circuit on the camera body 2 side is provided. Connected. The flexible wiring board 50 of the main control circuit extends from the front of the spool chamber cover 2d through the back of the main capacitor 30 and the back of the battery 31, to the front of the cartridge chamber cover 2c, and is connected to another flexible wiring board. It is something.

In addition, in FIG. 1, reference numeral 51 is a lock member for locking the back cover, 52 and 53 are holding plates for holding the upper parts of the gears of the gear train 13, and 54 is a lower part of the gear train of the gear train 13. The date imprinting illuminant, which also serves as a support member for pivoting, is a circuit portion thereof.

Next, the detection contact piece 17 installed on the patrone chamber cover 2c is made of a metal plate, and as shown in FIGS. 2 and 3, the front cover 14 installed in front of the patrone chamber cover 2c. A plurality of plates are arranged in parallel vertically between
The vicinity of one end of 17a is fixed to the outer surface of the cartridge chamber cover 2c, and the other end extending in the direction approaching the lens barrel unit 3 along this outer surface is elastically displaceable. A contact portion 17b protruding inward is provided at the other end portion, and the contact portion 17b can penetrate the patrone chamber cover 2c to contact the DX mark on the outer surface of the patrone C loaded in the patrone chamber P. Yes, it is possible to detect the DX code by the combination of whether the contact portion 17b of each detection contact piece 17 is in contact with the conductive portion or the insulating portion of the DX mark and know the information such as the corresponding film sensitivity. it can.

The patrone chamber cover 2c has a detection contact piece.
Contact piece opening that allows the contact part 17b of 17 to be inserted from the outside to the inside
A plurality of 24 are formed side by side in the vertical direction. A light blocking member 18b is provided at a part of the fixed barrel 18 of the lens barrel unit 3 to cover the outside of the contact piece opening 24 of the cartridge chamber cover 2c. The light blocking member 18b is formed to extend obliquely from the side of the fixed barrel 18 along the contact piece opening 24 in a direction approaching the front cover 14 on the front side of the camera 1.

A through hole 25 is also formed in the cartridge compartment cover 2c near the front cover 14, but the through hole 25 close to the front cover 14 is covered by the front cover 14. By doing so, there is no risk that penetrating light will pass through and the film will be exposed.

As shown in FIG. 2, a frame 57 and a light shield 58 are provided at the front end portion of the fixed barrel 18 between the fixed barrel 18 and the front cover 14 so as to prevent external light from sliding on the movable barrel 19. It is provided in a structure that reduces intrusion.

In the camera having the above structure, when the cartridge C is loaded in the cartridge chamber P, the contact portions 17b of the plurality of detection contact pieces 17 contact the DX marks (information display portion) provided on the outer surface thereof. Then, the information is read and, for example, automatic adjustment according to the film sensitivity is performed, and the adjustment when the cartridges C having different film sensitivities are loaded is unnecessary, and the photographing operation is simplified. A contact piece opening formed in the cartridge chamber cover 2c according to the arrangement of the detection contact piece 17
24 is directed toward the lens barrel unit 3, and external light entering the inside from between the front cover 14 and the moving barrel 19 is blocked by the light blocking member 18b integrally formed on the side of the fixed barrel 18, and the contact piece remains as it is. It does not pass through the use opening 24, and it is possible to prevent the film from wrapping around along the outer periphery of the cartridge C and being exposed to the film, so that good photographing can be performed.

Further, the light-shielding member 18b can be installed integrally with the fixed barrel 18, and the structure thereof is easy and the assembling process can be simplified.
Compared with the structure that is fixed to the Patrone chamber cover 2c together with 17, the space between the Patrone chamber cover 2c and the front cover 14 can be made narrower, and a compact camera with a light shielding structure and a small external dimension Are configured.

[0036]

According to the present invention, the patrone chamber in which the contact portion of the detection contact piece capable of contacting the information display portion of the patrone is inserted into a part of the fixed barrel of the lens barrel unit disposed adjacent to the patrone chamber. By disposing a light-shielding member that covers the outside of the contact piece opening of the cover, a structure for blocking exposure light through the contact piece opening to prevent exposure is installed without increasing the outer diameter of the camera. The camera can be constructed compactly.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a camera having a light-shielding structure according to an embodiment of the present invention with a front cover and other parts omitted.

FIG. 2 is a sectional plan view of a light shielding structure portion of the camera.

FIG. 3 is a front view of a main part of the same light-shielding structure portion.

[Explanation of symbols]

 1 camera 2 camera body 2c patrone chamber cover 3 lens barrel unit 4 photographing optical system C patrone P patrone chamber 14 front cover 17 detection contact 17b contact part 18 fixed tube 18b light-shielding member 19 moving tube 24 contact opening

Claims (2)

[Claims] 1. A mirror which accommodates a roll film and is provided with a cartridge in which a cartridge having an information display such as a DX mark corresponding to the film sensitivity and the like is loaded, and which is adjacent to the cartridge and holds a photographing optical system. A trunk unit is arranged, and a detection contact having a contact portion capable of contacting the information display portion is disposed on the outer surface of the cartridge chamber cover forming the cartridge chamber, and the cartridge chamber cover is further provided with: In a camera in which the contact portion of the detection contact piece has an opening for the contact piece that can be inserted from the outside to the inside, a part of the fixed barrel of the lens barrel unit that covers the outside of the opening for the contact piece of the cartridge chamber cover A light-shielding structure for a camera, in which members are provided. 2. The light-shielding member is formed so as to extend obliquely from a side of the fixed cylinder along the contact piece opening in a direction approaching a front cover of the camera. The light-shielding structure of the camera described in 1.