JPH07209714A - Camera and molding method and die for lens barrel therefor - Google Patents

Abstract

PURPOSE:To provide an inexpensive camera with reduced assembly man-hours. CONSTITUTION:Optical members 1-3 and an outside case member are integrally molded from the same transparent plastic member and the optical members 1-3 except a range used as an optical system are coated with a coating film for shielding light 6 or the optical members 1-3 made of the transparent plastic material and the outside case member 4 made of an opaque material are integrally molded with two colors. After an image pickup unit having a light receiving surface receiving the light of an objective to be picked up is inserted into a molding die, the position and posture of the light receiving surface are measured and then, an image pickup member is adjusted to obtain a desired position and posture. Then, the image pickup member and a lens barrel holding it are integrally molded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a popular type camera in which an optical member and an exterior member are integrally molded to reduce costs, and a molding method for integrally molding an imaging member with a lens barrel. It is about molds.

[0002]

2. Description of the Related Art In Japanese Unexamined Patent Publication No. 4-97110, a front lens unit and a front lens barrel and a rear lens unit and a rear lens barrel are integrally molded to reduce the number of parts and the number of assembling steps to reduce costs. A fixed focus lens for a video camera is disclosed.

[0003]

SUMMARY OF THE INVENTION The present invention is not limited to the conventional integral molding of a taking lens and a lens barrel as in Japanese Patent Laid-Open No. 4-97110, and at least one of optical members including a taking lens, a viewfinder and a strobe panel. By integrally forming one with a front cover that covers the front surface of the camera, the number of parts and the number of assembly steps can be further reduced. Moreover,
By integrally molding the lens barrel holding the image pickup member that receives the subject light with the front cover, the overall strength is increased and the focusing accuracy is improved.

It is also an object of the present invention to prevent unnecessary light generated by integral molding from entering the optical member.

Another object of the present invention is to adjust an image pickup member such as a CCD in a mold and then integrally form the lens barrel.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a light-shielding film is provided in the present invention except that an optical member and an exterior member are integrally molded of the same transparent plastic material and the optical member is used as an optical system. After inserting the imaging member having a light-receiving surface for receiving subject light into a molding die, the position and orientation of the light-receiving surface are measured to obtain a desired position and orientation. After adjusting the image pickup member so that the image pickup member and the lens barrel holding the image pickup member are integrally formed, a method for forming a lens barrel for a camera is solved.

[0007]

Embodiments of the present invention will be described in detail with reference to FIGS.

FIG. 1 is a perspective view of the camera of the first embodiment, and FIG. 2 is a sectional view taken along line AA of FIG. An optical member including a taking lens 1, a viewfinder objective lens 2, and a strobe front panel 3 is provided on the front surface of the camera.
It is integrally molded with the same plastic material as the front cover 4 which is an exterior member. Since these plastic materials are used for the optical members of the taking lens 1, the objective lens 2, and the front panel 3, they need to be transparent,
AS (acrylonitrile styrene), PC (polycarbonate), PMMA (polymethyl methacrylate)
Alternatively, ABS (acrylonitrile, butadiene, styrene) or the like is used. However, if another light ray that does not pass through the taking lens 1 is incident on the image pickup unit formed of a CCD or the like that receives the subject light from the taking lens 1, it causes fog, flare, or ghost, and the objective lens 2 is used even in the viewfinder. When other rays that do not pass through are incident,
It becomes very difficult to see due to internal reflection. Therefore, it is necessary to shield the light in order to prevent these unnecessary lights, but in the present embodiment, the light-shielding film is excluded except at the position 6 drawn by the chain double-dashed line in FIG. 2, that is, the range used as the optical system in the optical member. It is covered by. By using painting or plating as the light-shielding film, unnecessary light can be prevented. In addition,
It is desirable that both the front surface and the back surface of the front cover 4 have a black matting treatment, but if there is a design restriction on the front surface, it may be painted and plated with a predetermined color after the black matting treatment, or only the back surface. You may perform black matting treatment.

Although the position of the image pickup unit must be adjusted with high accuracy with respect to the taking lens 1, the position of the image pickup unit is not individually adjusted in a popular type camera, but is decided uniformly according to the component accuracy. If the lens barrel that holds the lens is configured by a separate member, the positional accuracy of the image pickup unit is generally deteriorated. Therefore, as shown in FIG. 3, the lens barrel 41 is integrally formed with the front cover 4 to improve the positional accuracy of the imaging member 7, and
Even when the strength of the photographic optical system including the photographic lens 1 and the imaging member 7 increases, and the front cover 4 is deformed by an external force, the photographic optical system is not adversely affected. In the case of a popular camera, the number of the photographing lens 1 may be one, but if a plurality of lens configurations including one or more other lenses 11 are provided, the photographing resolution is improved, but this additional lens is processed as a separate part. Then, it is attached to the lens barrel 41 by a known means.

The finder is composed of the objective lens 2 and the eyepiece lens. As shown in FIG. 2, the rear cover 5 and the eyepiece lens 51 can be integrally formed as in the front cover 4. The objective lens barrel 42 is formed integrally with the front cover 4, the eyepiece lens barrel 52 is formed integrally with the rear cover 5, and the objective lens barrel 42 and the eyepiece lens barrel 52 are formed inside the camera. When abutted against each other, the objective lens 2 and the eyepiece lens 51 are positioned at a predetermined lens interval, and the finder performance is improved.

The strobe reflects the light emitted from the xenon tube 31 by the reflecting mirror 32 as much as possible, and reflects it.
And the front panel 3 on which the Fresnel lens is formed irradiate with a predetermined light distribution characteristic.

As described above, when the taking lens 1 and the objective lens 2 or the front panel 3 are integrally formed,
External light that has entered the transparent objective lens 2 or the front panel 3 may travel through the front cover 4 like a light guide and reach the taking lens 1, which is likely to cause flare. Further, the light emitted from the strobe is also transmitted inside the front cover 4. For this purpose, the taking lens 1 and the objective lens 2
When the groove 43 is formed around the front panel 3, unnecessary light is less likely to be transmitted from the objective lens 2 and the front panel 3, and is less likely to be incident on the taking lens 1. Further, if a step is provided between the front surface periphery 44 of the taking lens 1 and the front surface periphery 45 of the objective lens 2, it becomes more difficult for unnecessary light to be transmitted. In addition,
The depth of the groove 43 is preferably 2/3 or less of the wall pressure,
The inner shape of the groove portion 43 is not limited to the semicircular shape as shown in the figure, but may be any shape.

FIG. 4 shows a hood around the front of the taking lens 1.
46 is a diagram in which the deep groove 47 is formed on the back surface of the hood 46, and unnecessary light must be largely diverted,
The unnecessary light never enters the taking lens. Further, the deep groove 47 also helps prevent sink marks on the hood 46.

FIG. 5 shows a groove 48 on the back surface of the front panel 3.
It is a diagram in which the reflection mirror 32 is formed and the groove portion 49 is formed also around the outer surface of the front panel 3 by these two groove portions 48 and 49 so that the light emitted from the strobe can be transmitted to the front cover 4. Disappears.

In the first embodiment described above, it is conceivable that the imaging member 7 is replaced with a film and the lens barrel 41 is used as a rail surface holding member for the film, but such a modified example is also within the scope of the present invention.

In the first embodiment, the optical member and the exterior member are made of the same plastic material.
A transparent plastic material is used for the optical member, and an opaque plastic material excellent in light shielding property and rigidity is used for the exterior member,
The optical member and the exterior member may be integrally molded in two colors.
In this case, the lens barrel 41, the objective lens barrel 42, and the eyepiece lens barrel 52 are also made of an opaque plastic material.

6 and 7 are views of a mold for insert molding an image pickup member, which is a second embodiment, FIG. 6 is a perspective view thereof, and FIG. 7 is a cross-sectional view thereof. First, the image pickup member 101 including a CCD or the like is inserted into the sliding mold 102.
102 is slidable in the spherical mold 103, and the spherical mold 103
Is configured to be freely rotatable in a three-dimensional direction in the fixed mold 104. Next, the position sensors 105, 106 and 107 are attached to the arm portion 104a of the fixed mold 104, and light is projected from three directions to the light receiving surface 101a of the image pickup member 101, and
The position and orientation of the image pickup member 101 are detected by the reflected light of a. Subsequently, since the light receiving surface 101a of the image pickup member 101 varies individually, based on the detection result, the rear portion 102a of the sliding die 102 is slid by an actuator (not shown) to move the image pickup member 101 to an appropriate position. While adjusting, the rear part 102a is shaken up and down or left and right together with the spherical mold 103 to move the image pickup member 101.
Is adjusted to an appropriate posture in the three-dimensional direction. After adjusting the image pickup member 101 to an appropriate position and posture in this way, the core 112 of the movable mold 111 is brought into close contact with the image pickup member 101, and plastic molding is performed by a known means. The tip of the core 112 is the light receiving surface 1 of the image pickup member 101 whose position and orientation are different from each other.
Since the core 112 has to be in close contact with 01a, the core 112 is provided with an elastic member such as a spring at the base so that the position and the posture of the light receiving surface 101a of the imaging member 101 can be freely adjusted. In this way, the lens barrel 100 having the image pickup member 101 inserted therein is formed.

The adjustment amount of the position and orientation of the image pickup member 101 is usually 0.5 mm and 2 degrees, respectively.

Further, the component molded at the same time as the image pickup member is not limited to the lens barrel, but the photographing lens and the front cover may be integrally molded as shown in FIG.

[0020]

As described above in detail, according to the present invention, the optical member and the exterior member are integrally molded from the same transparent plastic material, or the optical member and the exterior member are two-colored. Since it is molded, the number of assembly steps can be reduced, and an inexpensive camera can be realized.

Further, by integrally molding the lens barrel for holding the image pickup section in the above-mentioned molded product, the positional accuracy of the image pickup lens and the image pickup section is improved, and the image pickup optical system including the image pickup lens and the image pickup section is provided. Even if the front cover is deformed due to an increase in strength due to an external force, the photographing optical system is not adversely affected.

Furthermore, by forming a groove around the optical member, external light and strobe light are not transmitted through the front cover like a light guide, so that unnecessary light is transmitted to the photographing lens and flared. It does not cause any internal reflection in the viewfinder.

In addition, after the image pickup member is inserted into the mold, the position and orientation are detected and adjusted, and the image pickup member is molded together with the lens barrel to reduce the number of parts, the number of assembly steps, and the mounting strength of the image pickup member. There are effects such as improvement and less intrusion of dust.

[Brief description of drawings]

FIG. 1 is a perspective view of a camera according to a first embodiment.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a view in which a lens barrel and a front cover are integrally molded.

FIG. 4 is a view in which a hood is formed around the front surface of the taking lens.

FIG. 5 is a diagram in which a groove is formed on the back surface of the front panel, a reflecting mirror is inserted, and a groove is also formed around the outer surface of the front panel.

FIG. 6 is a perspective view of a mold for insert-molding an imaging member.

FIG. 7 is a cross-sectional view of a mold for insert-molding an imaging member.

[Explanation of symbols]

 1 Photographic lens 2 Objective lens 3 Front panel 4 Front cover 41,100 Lens barrel 43 Groove 6 Light-shielding coating 7,101 Imaging member 102 Sliding mold 103 Spherical mold 104 Fixed mold

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takashi Minaki 2970 Ishikawa-cho, Hachioji, Tokyo Konica stock company (72) Inventor Toshiyuki Terada 2970 Ishikawa-cho, Hachioji, Tokyo Konica stock company

Claims (8)

[Claims] 1. A camera characterized in that an optical member and an exterior member are integrally molded of the same transparent plastic material and are covered with a light-shielding film except for a range used as an optical system in the optical member. 2. A camera, wherein an optical member made of a transparent plastic material and an exterior member made of an opaque material are integrally molded in two colors. 3. The camera according to claim 1, wherein the optical member is at least one of a taking lens, a finder, and a strobe panel. 4. The camera according to claim 1, wherein a lens barrel holding an imaging member for receiving subject light is integrally molded. 5. The camera according to claim 2, wherein the lens barrel holding the image pickup member for receiving the subject light is integrally molded in two colors with an opaque material. 6. The camera according to claim 1, wherein a groove is formed around the optical member. 7. An image pickup member having a light-receiving surface for receiving subject light is inserted into a molding die, and then the position and orientation of the light-receiving surface are measured, and the image pickup member is adjusted so as to have a desired position and orientation. A method of molding a lens barrel for a camera, comprising integrally molding the imaging member and a lens barrel holding the imaging member after adjustment. 8. An inserting section for inserting an image pickup member having a light receiving surface for receiving subject light, a measuring section for measuring a position and a posture of the light receiving surface, and a light receiving surface having a desired position and posture. A mold for molding a lens barrel for a camera, comprising: an adjusting unit for adjusting the image capturing member, wherein the image capturing member and a lens barrel holding the image capturing member are integrally molded.