JP2001100307A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost of a camera by reducing the number of parts. SOLUTION: A protector for a stroboscope 6, a light receiving lens 10 and a finder objective lens 9 are horizontally arranged at the front surface of the camera in a straight line. Besides, they are integrally molded out of a transparent plastic material obtained by adding absorbent absorbing light beams at a short wavelength side and light beams at a long wavelength side out of the visible light beams.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera including a photographic camera, an electronic still camera, a film unit with a lens and the like, and more particularly to a camera having a plurality of optical members exposed to the outside on an outer cover. Things.

[0002]

2. Description of the Related Art In a compact camera, in order to reduce the number of parts and the number of assembling steps, for example, it is desired that parts formed of the same material be molded together. For example, it is impossible to integrally mold a member formed of an opaque material and a member formed of a transparent material, but it is possible to use any one of the materials. Therefore, as the plurality of transparent materials, a plurality of optical members exposed to the outside on the outer cover, for example, a protector for covering the front surface of the strobe discharge tube, a light receiving lens disposed in front of a light receiving element for photometry, and a finder There are lenses.

[0003]

However, although the protector and the light receiving lens are formed of a transparent plastic material, the additives to be added to the material are different.
This is because a xenon discharge tube is generally used as a light source of a strobe device. Xenon discharge tubes have a high color temperature of the illuminating light. For this reason, the protector is formed of a transparent plastic material to which an ultraviolet absorber is added in order to lower the color temperature. In general, a small CdS is used as a light receiving element of the photometric mechanism. Cd
S is also sensitive to infrared light. For this reason, an infrared light cut filter is arranged in front of the light receiving element, or the light receiving lens is formed of a transparent plastic material to which an infrared absorbing material is added in order to cut off infrared light. Therefore, although these optical members are molded of a transparent plastic material, they have a disadvantage that they cannot be integrally molded due to different additives.

An object of the present invention is to provide a camera in which the number of parts is reduced to reduce the cost.

[0005]

In order to achieve the above object, in the camera of the present invention, an optical member is integrally formed of a transparent plastic material to which an infrared absorbing material and an ultraviolet absorbing material are added. In the camera according to the second aspect,
At least two of a protector that covers the front surface of the strobe discharge tube, a window member that covers the front surface of the photometric light receiving element, and a finder objective lens are optical members.
Further, in the camera according to the third aspect, at least two of the protector, the window member, and the objective lens are arranged in a horizontal direction when viewed from the front. Further, in the camera according to the fourth aspect, a window member for displaying the number of shots is integrally formed with the optical member according to the second aspect.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, an outer cover of a camera 2 is composed of a front cover 3 and a rear cover 4. On the front cover 3, a shutter button 5, a protector 6 of a flash light emitting unit, a flash charging switch 7, a photographing lens 8, a finder objective lens 9, a photometric light receiving lens 10, a charge completion display window 11, and a photograph number display window 1
An opening that exposes 2 and the like to the outside is formed. And
The protector 6, the light receiving lens 10, and the objective lens 9
They are integrally formed of a transparent plastic material, and they are arranged side by side on a straight line along the horizontal direction when viewed from the front.

The rear cover 4 is provided with an opening for exposing the winding knob 13, an opening for exposing the eyepiece, and a back cover which is opened when the photographic film cartridge is loaded. These front cover 3 and rear cover 4
It is formed of an opaque plastic material.

[0008] As shown in FIG.
Main body base 15, exposure unit 16, strobe unit 1
7 etc. are incorporated. The main body base 15 has a patrone chamber 18 for accommodating a patrone, a film winding chamber 19 for winding a photographed photo film in a roll form, and an aperture on the back side between the patrone chamber 18 and the film winding chamber 19. Are formed. An exposure unit 16 is mounted on the front side of the aperture. Above the film take-up chamber 19 is a patrone chamber 18.
A winding knob 13 for winding the photo film toward the film winding chamber 15 is disposed.

The exposure unit 16 includes a photographic lens 8, a photometric mechanism, a finder eyepiece, a film counter mechanism, a film unwinding mechanism, and the like incorporated in a base member in which a dark box is formed.
0 is provided. A photographing lens 8 is attached to the front of the dark box, and a fixed aperture,
And a shutter mechanism that opens and closes behind the shutter. The dark box guides light passing through the taking lens 8 to the aperture. In the camera of the present embodiment, since the pan-focus operation is performed by the operation of the fixed-focus imaging lens 8 and the fixed aperture, focus adjustment is not required.

The film winding stop mechanism has a sprocket. The sprocket is engaged with the perforation of the photographic film and rotates following the film winding. The film winding stop mechanism detects the amount of rotation of the sprocket corresponding to the length of one frame, and when the amount of rotation is detected, prevents the rotation of the sprocket and the winding knob. Then, the film winding stopping mechanism releases the inhibition of the rotation after the completion of the exposure.

The film counter mechanism advances the number-of-photographs display plate 21 by one scale based on the rotation amount of the sprocket corresponding to the length of one frame. Photograph number display board 2
Numeral 1 indicates the remaining number of shots at that time to the outside through the number-of-shots display window 12 provided on the top plate 20. The display window 12 is a magnifying lens. The top plate 20 is formed of a transparent plastic material.

The strobe unit 17 includes a strobe board 23 having a strobe circuit, a strobe light emitting unit 24, a power supply battery 25, a charge completion indicator lamp 26, a main capacitor 27, and the like. This strobe unit 17
Charges the main capacitor 27 using the power supply of the power supply battery 25 in response to the sliding operation of the strobe charging button 7. When the charging is completed, the charging completion display lamp 26 is turned on or blinks. The display can be visually recognized from the outside through the charging completion display window 11 provided on the top plate 20.

As shown in FIG. 3, the protector 6, the light receiving lens 10, and the objective lens 9 are integrally formed in a form projecting one step toward the front from one plate 30. The member 31 is constituted. The optical member 31 is formed of a transparent plastic material to which an ultraviolet absorber and an infrared absorber are added. As the transparent plastic material, polymethyl methacrylate (PMMA), polycarbonate (PC), polystyrene (PS), or the like can be used.

As shown in FIG. 4, the optical member 31 is mounted on the inner wall of the front cover 3. The protector 6, the light receiving lens 10, and the objective lens 9 are exposed to the outside through the openings 3a to 3c of the front cover 3. Therefore, the front cover 3 which is an opaque member is interposed between the protector 6, the light receiving lens 10, and the objective lens 9. Thereby, it is possible to prevent harmful light from entering the camera 2.

The photometric mechanism comprises a light receiving lens 10, a photometric aperture plate 33, a light receiving element 34,
And an AE mechanism 35. Light receiving lens 10,
The aperture plate 33 and the light receiving element 34 are connected to the exposure unit 16 such that the space between the light receiving lens 10 and the light receiving element 34 is a dark room.
Are held by the member 16a constituting Light receiving element 34
Is CdS and has sensitivity in both the ultraviolet and infrared wavelength ranges. Therefore, by molding the light receiving lens 10 with a transparent plastic material to which an infrared absorbing material and an ultraviolet absorbing material are added, visible light of subject light can be received, thereby reducing photometric errors. it can. Further, the infrared light cut filter which is always required before the light receiving element can be omitted.

The light receiving lens 10 condenses subject light at a position different from the photographing optical axis and causes the light receiving element 34 to receive the light. In this embodiment, the light receiving lens 10 is disposed between the objective lens 9 and the protector 6 in order to mold the light receiving lens 10 with the same material as the protector 6 and the objective lens 9. The light receiving element 34 is a power supply battery 25 for a strobe.
Is driven by using the power supply supplied from the controller, the current is changed in accordance with the amount of light of the subject light.

Below the shutter button 5, a half-press switch 37 and a release switch 38 are arranged. The half-press switch 37 is turned on when the shutter button 5 is pressed down to a position approximately half of the pressing stroke. The release switch 38 is turned on when the shutter button 5 is pressed down to the end of the pressing stroke.

The AE mechanism 35 has a half-press switch 37
N, the light receiving element 34 is driven in response to the
The shutter opening / closing time of the shutter mechanism 39 is determined based on the current value obtained from the above and the film sensitivity. The film sensitivity is predetermined in this embodiment.

A setting member for setting the sensitivity of the photographic film may be provided externally so as to be able to use the film sensitivity set in the setting member. Further, in response to the sliding operation of the strobe charging switch 7, the light receiving element 3
4 may be driven. Further, a grip sensor for detecting gripping is provided on the grip portion of the front cover 3,
The light receiving element 34 may be driven according to the detection of the grip sensor. Further, a protective cover for protecting the photographing lens 8 may be provided on the front surface of the front cover 3 so as to be freely opened and closed, and the light receiving element 34 may be driven in response to opening and closing of the protective cover. Alternatively, a mechanical shutter having a constant opening and closing time and a variable aperture mechanism may be employed to switch the aperture according to the current value of the light receiving element 34.

The finder lens includes an objective lens 9 and an eyepiece 40. These objective lenses 9
The eyepiece 40 and the eyepiece 40 are supported by a member 16b constituting the exposure unit 16 so that a space between them is a dark room. The objective lens 9 is also formed of a transparent plastic material to which an infrared absorbing material and an ultraviolet absorbing material are added. Thereby, since harmful ultraviolet light and infrared light do not pass through the eyes, the eyes of the photographer can be protected.

The strobe light emitting section 24 is composed of a xenon discharge tube (hereinafter, referred to as a discharge tube) 41, a reflector 42, and a protector 6 disposed on the front of these.
The strobe circuit 43 sends a trigger signal to the discharge tube 41 in response to a synchro signal sent from the shutter mechanism 39 when the shutter blades are fully opened. When the discharge tube 41 receives the trigger signal, the discharge is promoted and the main capacitor 2 is discharged.
The light is emitted by the high voltage stored in. The strobe light is emitted toward the subject through the protector 6.

The protector 6 has a dustproof function of preventing dust and the like from entering the inside of the strobe light emitting unit 24 from the outside;
It has the function of a Fresnel lens for brightening the periphery of the irradiation range. The protector 6 is also formed of a transparent plastic material to which an infrared absorbing material and an ultraviolet absorbing material are added. For this reason, the light temperature of the strobe light emitted from the discharge tube 41 is reduced, and the inconvenience of the print photograph being bluish due to the high light temperature can be reliably prevented.

The operation of the above configuration will be described. To load the photo film, open the back cover. After loading, hoist knob 1
3 is rotated in the film winding direction. Thereby, the photographic film is pulled out from the patrone. When the first frame of the photographic film is set on the aperture, the film winding stopping mechanism operates to lock the film feeding and the rotation of the winding knob.

To perform flash photography, the flash charging button 7 is slid. The strobe circuit 43 is
The main capacitor 27 is started to be charged in response to the operation of the flash charging button 7. When the charging is completed, the charging completion display lamp 26 lights or blinks, and the display can be visually recognized through the charging completion display window 11.

When taking a picture, the composition is determined by looking into the subject from the eyepiece 40. At this time, since the objective lens 9 does not transmit ultraviolet and infrared light, it is possible to protect the eyes of the photographer. After the composition is determined, the shutter button 5 is pressed. At this time, the switch 37 for half-pressing is turned ON when the switch is pressed to a position substantially half of the pressing stroke. The AE mechanism 35 supplies power to the light receiving element 34 in response to the ON of the switch 37. As a result, the light receiving element 34 is driven, and the light receiving element 34 outputs a current corresponding to the amount of subject light incident from the light receiving lens 10. The AE mechanism 35
The opening / closing time of the shutter mechanism 39 is determined from the current value obtained from the light receiving element 34 and the film sensitivity. At this time, since the light receiving lens 10 does not transmit ultraviolet light and infrared light but transmits only visible light, it is possible to obtain an appropriate subject luminance.

When the full-press operation of the shutter button 5 is performed subsequently to the half-press operation, the full-press switch 38 is turned ON. The AE mechanism 35 drives the shutter mechanism 39 so as to have a predetermined opening / closing time in response to the ON of the switch 38.

When the shutter blades of the shutter mechanism 39 fully open the exposure aperture, a synchro signal is sent from the shutter mechanism 39 to the flash circuit 43. Strobe circuit 43
Applies a trigger signal to the discharge tube 41 in response to a synchro signal. As a result, the discharge tube 41 is discharged by the high voltage stored in the main capacitor 27. By this discharge, the strobe light is irradiated toward the subject through the protector 6. At this time, the protector 6 transmits only visible light without transmitting ultraviolet and infrared light. Thus, the subject can be illuminated with a natural color.

The light reflected from the subject passes through the taking lens 8 and enters the photographic film set on the aperture. When the opening and closing operation of the shutter mechanism 39 is completed, the lock of the film winding stop mechanism is released, and the film feeding and the rotation of the winding knob 13 are allowed. Thereafter, a film winding operation is performed to prepare for the next shooting. After the photographing of the last photographing frame is completed, the winding knob 13 is rotated in the film winding direction, and the photographed film is stored in the cartridge.

In the above embodiment, the outer cover is not limited to the front cover 3 and the rear cover 4 which are divided into two parts from the front and rear, but may be constituted by, for example, three front and rear covers.
Further, although the protector 6, the light receiving lens 10, and the objective lens 9 are integrally molded, at least two of them may be integrally molded. Further, the number-of-photographs display window 12 provided on the upper surface side of the outer cover and at least any two of the protector 6, the light receiving lens 10, and the objective lens 9 may be integrally formed. For example, in the example shown in FIG. 5, the number-of-photographs display window 12, the light receiving lens 10, and the objective lens 9 are integrally formed to constitute the optical member 50.

In the above embodiment, the light receiving lens 10 is provided on the front surface of the outer cover, and the light receiving lens 10 is attached to the protector 6.
And an objective lens 9 together with a transparent plastic material to which an infrared absorbing material and an ultraviolet absorbing material are added. However, the present invention is not limited to this, and when a window member is arranged on the front surface of the light receiving lens 10, The window member is protected 6
Alternatively, it may be integrally molded with a transparent plastic material to which an infrared absorbing material and an ultraviolet absorbing material are added together with the objective lens 9.

In the above embodiment, a photographic camera is used. However, the present invention can be applied to an electronic still camera. Further, the present invention can be applied to a film unit with a lens in which an unexposed photographic film is loaded in advance. In this case, a patrone chamber for accommodating a patrone at the base of the main body and a film storage chamber for accommodating unexposed photographic film drawn out of the patrone in a roll form are provided. In this case, the exposed photographic film may be wound into a cartridge by the film winding operation described above.

[0032]

As described above, according to the camera of the present invention, since a plurality of optical members are integrally molded from a transparent plastic material to which an infrared absorbing material and an ultraviolet absorbing material are added, the number of parts can be reduced. Therefore, cost reduction can be achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the appearance of a camera according to the present invention.

FIG. 2 is an exploded perspective view showing a main part of the camera.

FIG. 3 is a perspective view showing an optical member obtained by integrally molding an objective lens, a light receiving lens, and a protector.

FIG. 4 is a sectional view of an optical member.

FIG. 5 is a perspective view showing another example in which a number-of-photographs display plate, an objective lens, and a light receiving lens are integrally formed.

[Explanation of symbols]

 2 Film unit with lens 3 Front cover 4 Rear cover 6 Protector 7 Shutter button 8 Shooting lens 9 Objective lens 31, 50 Optical member

Continued on the front page (72) Inventor Shigeki Takahara 210 Nakanakanuma, Minamiashigara-shi, Kanagawa Prefecture Fuji Photo Film Co., Ltd. F-term (reference) 2H053 AB01 AC16 AD03 BA21 BA77 CA02 CA12 CA22 2H083 AA04 AA11 AA29 AA30 AA32 2H101 AA03 BB04 2H105 DD06

Claims (4)

[Claims] 1. A camera, wherein a plurality of optical members provided to be exposed outside the outer cover are integrally formed of a transparent plastic material to which an infrared absorbing material and an ultraviolet absorbing material are added. 2. The optical device according to claim 1, wherein said optical member is at least one of a protector for covering a front surface of a strobe discharge tube, a window member for covering a front surface of a photometric light receiving element, and a finder objective lens. The camera according to 1. 3. The camera according to claim 2, wherein at least two of a protector, a window member, and an objective lens constituting the optical member are arranged in a horizontal direction when viewed from the front. 4. The camera according to claim 2, wherein a window member for displaying the number of shots is further integrally formed with said at least any two optical members which are integrally formed.