JPH09203918A - Film unit with lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To deepen the depth of field by a certain amount by making a filter arranged at the inside of an optical path have a circular or polygonal aperture which is smaller than the aperture diameter of a diaphragm. SOLUTION: A photographing lens L, the diaphragm 4 and the filter at the inside of the optical path of the photographing lens L are arranged at a film unit with lens 10. The filter 2 possesses the aperture A1 smaller than the diameter of the aperture A2 of the diaphragm 4, and the outside of the aperture A1 is formed of photochromic material, and the inside of the aperture A1 is formed of a transparent body integral with the photochromic material at the outside of the aperture A1. In this case, light quantity is controlled by the aperture A1 of the filter 2 smaller than the aperture A2 of the diaphragm 4, so that negative density is made low by the certain amount and the depth of field is made deep by the certain amount. Also, in the case of a low luminance object, the photochromic material is decolorized, so that under-exposure is prevented as much as possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film unit with a lens, which is preliminarily loaded with a film and which enables immediate photographing.

[0002]

2. Description of the Related Art In a film unit with a lens of a simple camera which does not have an automatic exposure adjusting mechanism using mechanical or electronic technology, a filter using a photochromic material or a photochromic material is used as a method for simply adjusting the exposure. It has been proposed to perform exposure adjustment by using a lens mixed with a material.

[0003]

However, the simple exposure adjustment technique using this photochromic material has the following problems.

(1) It is necessary to increase the aperture diameter to some extent in consideration of low-luminance photography, so the depth of field is always shallow. With a camera with a shallow depth of field, it is difficult to make a sharp photograph with a fixed focus lens film unit.

(2) It takes a certain amount of time for the photochromic material, which is colored gray by receiving strong light and has a reduced light transmittance, to lose its color and improve the light transmittance. If a low-brightness subject is photographed immediately after the subject is photographed, the photochromic material remains photographed, resulting in underexposure. From such underexposed negatives,
It is difficult to make high quality pictures.

(3) If the aperture diameter is increased or a high-sensitivity film is built in to photograph a low-brightness subject, when a high-brightness subject is photographed, the exposure amount exceeds the photochromic adjustable range. It will be overexposed. As a result, the negative density becomes high as a whole, and a long exposure time is required at the time of printing, resulting in a marked decrease in laboratory efficiency.

The present invention has been made to solve the above problems, and is to achieve the following objects in a simple exposure adjusting function using a photochromic material.

(A) To make the depth of field deeper to a certain extent (b) To make it possible to reduce underexposure of a low-luminance object as much as possible (c) To keep the negative density low without increasing the overall negative density To be able to

[0009]

The object of the present invention is achieved by adopting the following constitution.

The imaging lens includes a photographing lens, a diaphragm, and a filter arranged in the optical path of the photographing lens. The filter has a circular or polygonal diaphragm hole smaller than the diaphragm hole diameter of the diaphragm, and the diaphragm. A film unit with a lens, characterized in that the outside of the hole is formed of a photochromic material.

Further, it has a taking lens, a diaphragm, a manual operating member, and a filter which moves in and out of the optical path of the taking lens in association with the operation of the manual operating member, and at least a part of the filter is a photochromic material. A film unit with a lens, which is made of

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings and FIGS. 4 to 7. First, an example of the outline of a film unit with a lens used in the present invention will be described with reference to FIGS. This will be described with reference to FIG.

FIG. 1 is a front view of the film unit with lens, FIG. 2 is a plan view for explaining the internal structure of the film unit with lens, and FIG. 3 is an exploded perspective view of the film unit with lens.

The film unit with a lens is a simple camera unit that is put on the market with a photographic film (hereinafter referred to as a film) loaded, and the film is loaded in the process of assembling the film unit with a lens, and the user can use the film. Operations such as loading and rewinding are unnecessary,
You can shoot immediately.

1, 2 and 3, the present lens-equipped film unit 10 includes a body B1, a front cover B2 and a front cover B2.
The rear cover B3 and the rear cover B3 are assembled from both sides. A shooting frame B4 is provided at the center of the body B1, and a cartridge chamber B5 is provided on one of the left and right sides of the shooting frame B4 and a film roll chamber B6 is provided on the other side. The film cassette chamber B5 is loaded with the film cartridge chamber P5.
A film F wound around a spool S is stored in the film 6, and the film F is wound around a patrone P by a winding mechanism B7 at the time of photographing.

The hoisting mechanism B7 is composed of a hoisting knob B8 and the like, and is arranged above the patrone chamber B5 and above the photographing frame B4. In front of the photographing frame B4, a diaphragm 4 and a photographing lens L are provided. . Furthermore, a finder Fd is arranged above the shooting frame B4.

The film unit with a lens 10 includes
A strobe device E1 is provided. Strobe device E1
The flash substrate E2 is mounted on the front side of the film roll chamber B6. The circuit element E is provided on the strobe board E2.
3 is arranged, and the discharge tube 121 is connected to the upper position,
This discharge tube 121 is used for the stroboscopic light emission window 12 of the front cover B2.
It is facing 2.

A main capacitor E4 is connected to a position below the strobe board E2, and a battery E5 is connected to the strobe board E2 by a lead plate E6. Then, the discharge tube 121 is caused to emit light by the current charged in the main capacitor E4 from the battery E5. A strobe switch 1 is provided below the strobe light emission window 122, and the strobe switch 1 is moved to turn on the power when photographing a strobe.

Next, an embodiment of the present invention will be described with reference to FIGS. 4 to 7, but the present invention is not limited to this embodiment to be described.

FIG. 4 is a diagram of an embodiment for explaining a filter and a diaphragm according to the present invention. (A) is a sectional view of a main part, (b) is a sectional view taken along the line X--X, and (b) is a sectional view. It is a front view. FIG. 5 is a diagram of an embodiment for explaining the operation of the filter according to the present invention, where (a) is a cross-sectional view of the main part (b).
Is a cross-sectional view taken along line X--O--X of FIG. 6 is a diagram of an embodiment of a filter using a photochromic material, and FIG. 7 is a diagram of another embodiment of a filter using a photochromic material.

First, the filter will be described with reference to FIGS. In FIGS. 6 and 7, reference numeral 2 denotes a circular or polygonal aperture hole A1 centered on the optical axis OA having a hole diameter of 0, and at least a part of the outside of the aperture hole is formed by a photochromic material PC, or A filter formed by forming the outer side of the aperture hole A1 with a photochromic material PC and an inner side of the aperture hole A1 with a transparent body 20 integrated with the photochromic material PC, or a filter in which the aperture hole A1 is a through hole, or The outside of the aperture hole A1 is an opaque body 200, and the inside of the aperture hole A1 is one of the filters formed by the photochromic material PC.

Next, in FIG. 4, the film unit with a lens 10 is provided with a taking lens L, a diaphragm 4, and a filter 2 in the optical path of the taking lens L as shown. The filter 2 has a diaphragm hole A1 smaller than the hole diameter of the diaphragm hole A2 of the diaphragm 4, the outside of the diaphragm hole A1 is formed of a photochromic material PC, and the inside of the diaphragm hole A1 is a photochromic material PC outside the diaphragm hole A1. It uses the filter described above, which is made of an integral transparent body.
The filter 2 may be the above-mentioned filter having a hole through which the throttle hole A1 of the filter 2 passes.

When a high-brightness subject is photographed by the film unit with a lens 10 constructed as above,
The aperture 2 A1 of the filter 2 is formed of the photochromic material PC and is smaller than the aperture A2 of the aperture 4.
The amount of light is suppressed by the aperture hole A1 of No. 2, the negative density can be lowered to some extent, the depth of field can be made to some extent deep, and a sharp photograph can be obtained. Further, in the case of a low-brightness subject, it is possible to minimize the disappearance of the photochromic material PC from being undercolored.

Next, FIG. 5 will be described. In FIG. 5, a filter operating rod 21 is attached to the filter 2 as shown. The filter operating rod 21 is supported by the main body so as to be slidable in the left-right direction, which is the axial direction of the rod, by means not shown, so that the filter 2 does not affect the lens L from the position indicated by the chain double-dashed line. , And the position of the solid line (dotted line in the front view) that coincides with the optical axis of the lens L.

Further, a knob 3 which is a manual operation member is attached to the tip of the filter operating rod 21, and the tip of the knob 3 is moved forward through a front cover groove B21 provided in the front cover B2 as shown in the figure. By operating the tip of the knob 3 as a manual operation member, which protrudes from the cover B2, with a finger, the filter 2 is moved into and out of the optical path of the taking lens L in conjunction with the operation of the knob 3 as the manual operation member. Is possible.

The position of the filter 2 indicated by the solid line (dotted line in the front view) is aligned with the optical axis of the lens L by operating the knob 3 as a manual operation member with a finger to move the filter 2 rightward. The position. When a bright high-luminance subject is photographed in such a lens-equipped film unit, the filter 2 using the photochromic material PC is inserted in the optical path of the photographing lens L.

As described above, in the film unit 10 with the present lens, the taking lens L, the diaphragm 4, the knob 3 as the manual operation member, and the knob 3 as the manual operation member are operated in association with each other. A filter 2 that moves forward and backward in the optical path is arranged as shown in the figure. The filter 2 uses the above-mentioned filter in which the hole diameter of the aperture hole A1 of the filter 2 is 0 and at least a part of the outside of the aperture hole A1 is formed of the photochromic material PC.

The filter 2 has a circular or polygonal aperture hole A1 smaller than the aperture diameter of the aperture hole A2 of the aperture stop 4, and the outside of the aperture hole A1 is formed by a photochromic material PC, and the inside of the aperture hole A1. May be the above-mentioned filter formed by the transparent body 20 integrated with the photochromic material PC, or the above-mentioned filter in which the aperture hole A1 is a through hole. Furthermore, the filter 2 has a circular or polygonal aperture hole A1 smaller than the aperture diameter of the aperture hole A2 of the aperture stop 4. The outside of the aperture hole A1 is made an opaque body, and the circular or polygonal aperture hole A1 The above-mentioned filter whose inner side is formed of the photochromic material PC may be used.

Here, the effects of the exposure amount adjustment and the diaphragm when the filters 1 to 3 are respectively adopted will be described.

Filter: In the case of this filter, the photochromic material PC is on the outside of the aperture hole A1 and the inside is the photochromic material with the aperture diameter of A1 being 0, so that the exposure amount of the photochromic material PC is It can be adjusted.

Filter: In the case of this filter, the photochromic material PC is outside the diaphragm hole A1, the diaphragm hole A1 of the filter 2 is a diaphragm hole smaller than the hole diameter of the diaphragm hole A2 of the diaphragm 4, and the inside is the photochromic material PC. Since the transparent body 20 is an integral body, in the case of a high-luminance subject, the exposure amount can be adjusted by the difference in diameter between the diaphragm hole A2 of the diaphragm 4 and the diaphragm hole A1 by the filter, and the diaphragm hole A1 of this small filter is also possible. This makes the depth of field deeper to a certain extent, making it possible to take sharp pictures.

Filter: In the case of this filter, since the photochromic material PC is on the outside of the aperture hole A1 and the through hole is on the inside, the filter is substantially the same as the filter, and therefore its effect is the same as that of the filter. Is the same.

Filter: In the case of this filter, the outer side of the aperture hole A1 is the opaque body 200, and the inner side is formed of the photochromic material PC. Therefore, in the case of a high brightness subject, the aperture hole A2 of the aperture stop 4 and the filter are used. The exposure amount can be suppressed by the synergistic effect of adding the exposure amount adjusting function of the photochromic material PC in addition to the exposure amount adjustment by the difference in the aperture diameter. Therefore, it is possible to adjust the exposure amount beyond the exposure amount adjustment range of the photochromic material, it is possible to suppress the negative density as a whole to a low level, and the aperture hole A1 of the filter smaller than the aperture hole A2 of the aperture stop 4 is used. The depth of field is deeper to a certain extent, making it possible to take sharp pictures.

Next, when a low-luminance subject is photographed immediately after a high-luminance subject is photographed, the knob 3 is operated with a finger to move the filter 2 to the left, and the photochromic material P is moved.
The filter 2 using C is retracted out of the optical path of the taking lens L. Since the low-brightness subject is not photographed when the photochromic material PC remains colored, the underexposure photographing can be reduced as much as possible.

In this embodiment, the film unit with a lens with a strobe has been described as an example, but it goes without saying that the film unit with a lens without a strobe can also be applied.

[0036]

The structure of the invention according to claim 1 has an effect that a sharp photograph can be obtained because the depth of field can be increased to some extent.

The configurations of the inventions according to claims 2 and 3 have the effect of giving a degree of freedom to the manufacturing method of the filter and reducing the cost.

The structure according to the fourth aspect of the present invention has an effect that it is possible to reduce underexposure of a low-luminance object as much as possible and to make a high-quality photograph.

The structure according to the fifth aspect of the present invention has an effect that the underexposure of a low-luminance subject can be reduced as much as possible and the depth of field can be deepened to some extent.

The structure of the invention according to claim 6 has an effect that the underexposure of a low-luminance object can be reduced as much as possible, the depth of field can be deepened to some extent, and the negative density can be suppressed as a whole. .

As described above, according to the present invention, the depth of field can be made deeper to some extent, so that a sharp photograph can be obtained, or an underexposed low-luminance object can be reduced as much as possible to obtain a high-quality photograph. Since the film thickness can be kept low, a film unit with a lens that can provide a negative with good lab efficiency is provided.

[Brief description of drawings]

FIG. 1 is a front view of an example of a film unit with a lens.

FIG. 2 is a plan view illustrating an internal configuration of the film unit with lens of FIG.

FIG. 3 is an exploded perspective view of the film unit with lens of FIG.

FIG. 4 is a diagram of an embodiment for explaining a filter and a diaphragm based on the present invention.

FIG. 5 is a diagram of an embodiment illustrating the operation of the filter according to the present invention.

FIG. 6 is a diagram of a filter using a photochromic material according to the present invention.

FIG. 7 is another view of a filter using a photochromic material according to the present invention.

[Explanation of symbols]

 1 Strobe switch 10 Film unit with lens 2 Filter 20 Transparent body 21 Filter operating rod 200 Opaque body 3 Knob 4 Aperture A1 Aperture aperture for filter A2 Aperture aperture for aperture B21 Front cover groove L Photographic lens OA Optical axis PC Photochromic material

Claims (6)

[Claims] 1. A photographing lens, a diaphragm, and a filter arranged in an optical path of the photographing lens, wherein the filter has a circular or polygonal diaphragm hole smaller than a diaphragm hole diameter of the diaphragm, and A film unit with a lens, characterized in that the outside of the aperture is made of a photochromic material. 2. The lens-equipped film unit according to claim 1, wherein the inside of the aperture of the filter is a transparent body integrated with the photochromic material. 3. The lens-equipped film unit according to claim 1, wherein the aperture of the filter is a through hole. 4. A photographing lens, an aperture stop, a manual operation member, and a filter which moves in and out of the optical path of the photographing lens in association with the operation of the manual operation member, and at least a part of the filter is a photochromic material. A film unit with a lens, which is made of 5. The lens according to claim 4, wherein the filter has a circular or polygonal aperture hole smaller than the aperture diameter of the aperture, and the outside of the aperture hole is formed by a photochromic material. Film unit with. 6. The filter has a circular or polygonal aperture hole smaller than the aperture diameter of the aperture, the outside of the aperture hole is made opaque, and the inside of the circle or polygonal aperture hole is formed. The film unit with a lens according to claim 4, wherein the film unit is formed of a photochromic material.