JP2001021976A - Photographing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a photographing device which is low in price, without increasing the number of part items and superior in assembling workability. SOLUTION: A low-pass filter 18 is attached to a filter attachment part 15 at the light emitting side of a lens case 13 having a photographing lens. Then, a filter pressing member 19 for pressing the filter 18 is arranged between the filter 18 and a solid-state image pickup element 20. Moreover, the pressing member 19 is provided with a light shielding part 25 which surrounds the outer circumferential side surface of the element 20. Therefore, since external light is prevented surely from entering from the side surface of the end part of the element 20 by the shielding part 25 and noise is prevented from being caused, a clear image can be obtained. In addition, since the pressing member 19 is specially provided with the shielding part 25, the number of part items will not increase, and a gap between the case 13 and the element 20 need not be made narrow, as in conventional devices. Thus, an inexpensive photographing device whose assembling workability is satisfactory is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a photographing device such as a digital camera.

[0002]

2. Description of the Related Art In a photographing apparatus, a digital camera is widely known as an electronic camera for photographing a subject without using a film. This type of digital camera includes, for example, a lens unit having a shooting lens in a lens case, and an imaging unit having a solid-state imaging device such as a CCD. The solid-state imaging device is configured to form an image and output the formed image of the subject as an electric signal.

[0003]

In such a digital camera, when external light enters from a side surface of an end portion of a solid-state imaging device such as a CCD, noise is generated in an image, and a clear image cannot be obtained. For this reason, conventionally, the solid-state imaging device is housed in a special case, or the gap between the solid-state imaging device and the lens case is narrowed, thereby preventing external light from entering from the side surface of the solid-state imaging device. In. However, in the former digital camera, since a special case must be used, there is a problem that the number of parts increases and the manufacturing cost increases. Further, in the latter digital camera, since the gap between the solid-state imaging device and the lens case is narrow, the assembling workability is deteriorated, which also causes a problem that the manufacturing cost is increased.

An object of the present invention is to prevent the number of parts from increasing,
An object of the present invention is to provide a low-priced product with good assembling workability.

[0005]

According to the present invention, there is provided a lens unit having a photographic lens in a lens case, and an imaging unit having a low-pass filter and a solid-state image sensor. In a photographing apparatus for photographing by forming an image on the solid-state imaging device through the low-pass filter of the imaging unit, a filter mounting unit to which the low-pass filter is mounted is provided at a rear end portion of the lens case on the light emission side. A filter holding member that holds the low-pass filter is provided between the low-pass filter mounted on the filter mounting portion and the solid-state imaging device, and a light-shielding portion surrounding the outer peripheral side surface of the solid-state imaging device is provided in the filter holding member. It is characterized by.

According to the present invention, a filter holding member for holding the low-pass filter is provided between the low-pass filter mounted on the filter mounting portion at the rear end of the light exit side of the lens case and the solid-state image pickup device. Since the member has a light-shielding portion surrounding the outer peripheral side surface of the solid-state image sensor, the light-shielding portion can prevent external light from entering from the side surface of the end portion of the solid-state image sensor, thereby preventing noise from being generated, thereby providing a clear image. In addition to this, it is possible to obtain a clear image, and in particular, since the filter holding member is provided with a light-shielding portion, the number of components does not increase, and the gap between the lens case and the solid-state imaging device needs to be narrowed as in the conventional case. Since there is no such structure, it is possible to obtain a product having good assembling workability and low cost.

In this case, as described in claim 2, an element mounting member to which the solid-state imaging device is mounted, a screw member for mounting the element mounting member to a rear end of the lens case on the light emitting side, and An angle adjusting member disposed between the element mounting member and the lens case to adjust the tilt angle of the solid-state imaging device, wherein the angle adjusting member is provided on the screw member from a direction orthogonal to an axial direction thereof. By having a notch that can be inserted and removed, just loosen the screw member without removing it from the lens case,
The angle adjusting member can be inserted into and removed from the screw member located between the solid-state imaging device and the lens case, whereby the tilt angle of the solid-state imaging device can be easily adjusted.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a photographing apparatus according to the present invention is applied to a digital camera will be described below with reference to FIGS. FIG. 1 is an external perspective view of the digital camera. This digital camera includes a camera body 1 and a lens body 2. Camera body 1
As shown in FIG. 1, an operation mechanism is integrated on an upper surface and a rear surface (a front side surface in FIG. 1). For example, a viewfinder 3 composed of a color liquid crystal display device is provided on the back of the camera body 1. A power switch 4 is provided on the upper right of the viewfinder 3.
At the lower right of the power switch 4, a mode changeover switch 5 for switching the operation mode between the image shooting mode RE and the image reproduction mode PL is provided. On the top surface of the camera body 1, a shutter button 6, a "+" key 7 for sequentially retrieving captured and recorded images, and a "-" key 8 for sequentially retrieving images preceding the displayed image are provided. ing.

As shown in FIG. 1, a lens unit 10 is disposed inside the lens body 2 so as to be exposed on the rear side (the front side in FIG. 1). Mounted as possible. This lens body 2
Normally, the lens unit 10 is turned 180 degrees in the direction of arrow A in FIG. 1 so that the lens unit 10 faces the front (the back in FIG. 1), and normal photographing is performed in this state. When the lens body 2 is rotated by 180 ° in the direction of arrow B shown in FIG. 1 and the lens unit 10 faces the back (the front in FIG. 1), the position of the lens unit 10 is upside down. , And the image being shot becomes an inverted image upside down,
The attitude of the taking lens is detected by an internal circuit, and the image being taken is automatically corrected to an erect image and displayed on the viewfinder 3.

The lens unit 10 comprises a lens unit 11 and an image pickup unit 12, as shown in FIG.
The lens unit 11 includes a photographic lens (not shown) in a lens case 13. The lens case 13 is provided with a mounting portion 14 to which the imaging unit 12 is mounted at a rear end, that is, an end on the light emission side. This mounting part 14 is shown in FIG.
As shown in FIG. 4 and FIG. 4, the filter mounting portion 15, the presser mounting portion 16, and the element housing portion 17 are formed so as to become gradually larger from the front side (the left side in FIG. 3). The imaging unit 12 includes a low-pass filter 18, a filter pressing member 19, a solid-state imaging device 20, an element mounting plate 21, and a flexible wiring board 22 in order from the lens unit 11 side.

The low-pass filter 18 is for preventing the occurrence of moire, and is made of, for example, a quartz plate, and has an infrared cut layer (not shown) for cutting infrared rays on either the light incident surface or the light output surface. Is provided. As shown in FIG. 3, about half of the low-pass filter 18 on the front side (the left side in FIG. 3) in the thickness direction is mounted in the filter mounting portion 15 of the lens case 13. The filter pressing member 19 is made of an elastic material such as rubber, and elastically presses the low-pass filter 18 to the filter mounting portion 15 of the lens case 13, and is formed in a substantially frame shape as shown in FIG. .

That is, the filter pressing member 19 is
As shown in FIG. 4, the holding frame mounting portion 23, the pressing portion 24, and the light shielding portion 25 are integrally formed in a stepwise manner. In this case, the holding frame mounting portion 23 is elastically mounted on the rear end peripheral portion of the low-pass filter 18 protruding from the filter mounting portion 15 of the lens case 13.
The lens case 13 is disposed inside the holding portion 16. The pressing portion 24 is disposed between the peripheral edge of the rear surface of the low-pass filter 18 and the peripheral edge of the front surface of the solid-state imaging device 20, and in this state, elastically presses the low-pass filter 18 toward the front side (the left side in FIG. 3). are doing. The light-shielding portion 25 is formed so as to protrude in a skirt shape from the rear end peripheral portion of the holding frame mounting portion 23 toward the outer peripheral side of the solid-state imaging device 20, so as to surround substantially the entire outer peripheral side surface of the solid-state imaging device 20. It is configured. The skirt-shaped light shielding portion 25 is formed to have a small thickness, so that it can be easily elastically deformed.

The solid-state image pickup device 20 has a charge-coupled device such as a CCD, converts received light into an electric signal and outputs the electric signal. The light incident surface, that is, the front surface (the left side surface in FIG. 3) is protected. A glass 26 is provided. As shown in FIGS. 3 and 4, the solid-state imaging device 20 has a rear surface adhered to an element mounting plate 21.
1 is mounted on the mounting portion 14 of the lens case 13, thereby being housed in the element housing portion 17 of the lens case 13. Note that a plurality of connection pieces 20a are provided on the upper and lower edges of the solid-state imaging device 20 so as to protrude toward the rear side (the right side in FIG. 3).

The element mounting plate 21 is for fixing the solid-state imaging device 20 to the lens case 13, and as shown in FIG.
It is formed in a flat plate shape having attachment pieces 28 and 29 attached to the attachment portion 14 of the lens case 13 on both left and right sides of the lens case 13. In this case, the vertical length of the element bonding portion 27 is equal to or shorter than the vertical length of the solid-state imaging device 20, thereby connecting the solid-state imaging device 20 as shown in FIG. The piece 20a projects toward the rear side (the right side in the drawing) of the element bonding section 27.
In addition, the length in the left-right direction is formed longer than the length in the left-right direction of the solid-state imaging device 20. In addition, a through hole 27 a is provided in the center of the element bonding portion 27.

One of the left and right mounting pieces 28, 29 of the element mounting plate 21 is provided with a single screw 30 at a substantially intermediate portion of the left mounting piece 28 shown in FIG. The right mounting piece 29 has a screw 3
0 is inserted. As shown in FIG. 4, these screws 30 are screwed into respective screw mounting holes 31 provided in the mounting portion 14 of the lens case 13, so that the element mounting plate 21 is mounted on the mounting portion 14 of the lens case 13. I have. Each of the mounting pieces 28 and 29 is provided with a board mounting hole 32.

The flexible wiring board 22 is mounted on the rear surface (the right side surface in FIG. 2) of the element mounting plate 21, and in this state, the solid-state imaging device 20 is electrically connected by the connection piece 20a. In this case, the flexible wiring board 22
As shown in FIG. 2, the width in the left-right direction is
Of the lens case 13, and the length in the vertical direction is longer than the length in the vertical direction of the mounting portion 14 of the lens case 13. A connecting portion 33 extends from the upper end of the flexible wiring board 22. The flexible wiring board 22 is provided with mounting holes 34 corresponding to the respective substrate mounting holes 32 provided in the element mounting plate 21. Further, the flexible wiring board 22 is connected to an electronic circuit (not shown) in the camera body 1 as an electric signal by using an image of a subject taken by the solid-state imaging device 20 when the connection section 33 is guided into the camera body 1. It is configured to output.

The mounting portion 14 of the lens case 13
As shown in FIGS. 2 and 4, an angle adjustment member 35 for adjusting the tilt angle of the solid-state imaging device 20 is detachably provided between the solid-state imaging device 20 and the mounting piece 28 of the element mounting plate 21. That is, as shown in FIG. 5, the angle adjusting member 35 has a configuration in which a bent portion 37 is bent at a substantially right angle at one end of the flat plate portion 36. In this case, the flat plate portion 36 includes the screw 30 from a direction orthogonal to the axial direction of the screw 30.
A substantially U-shaped notch 38 is formed in the other end of the flat plate portion 36 so as to be removably inserted into the flat plate portion 36. Further, as shown in FIG. 4, the bending portion 37 positions the angle adjusting member 35 by abutting on the outer surface of the mounting portion 14 of the lens case 13. Note that a plurality of angle adjusting members 35 are prepared, and the thicknesses of the flat plate portions 36 are different from each other, so that the tilt angle of the solid-state imaging device 20 can be selected.

Next, a case where an object is photographed by such a digital camera will be described. First, in FIG. 1, the lens body 2 is rotated 180 ° in the direction of arrow A so that the lens unit 11 of the lens unit 10 faces the front (the back in FIG. 1), and in this state, the power switch of the camera body 1 is turned on. When the switch 4 is turned on, normal photographing is performed, and the subject photographed by the lens unit 10 is displayed as an erect image on the viewfinder 3 of the camera body 1. It should be noted that even when the lens body 2 was turned 180 ° in the direction of arrow B shown in FIG. 1 and the lens unit 11 of the lens unit 10 was turned to the back (the front in FIG. 1), an image was taken with the lens unit 10. The subject is displayed as an erect image on the viewfinder 3 of the camera body 1.

As described above, in this digital camera, the filter mounting portion 1 at the rear end of the lens case 13 on the light emitting side is provided.
5 and a low-pass filter 18 and a filter holding member 1
9, the holding frame mounting portion 23 is elastically mounted and disposed on the holding mounting portion 16 of the lens case 13. In this state, the element mounting plate 21 to which the solid-state imaging device 20 is adhered is attached to the lens case 13 by screws 30. When screwed into the screw mounting hole 31 of the part 14, the element mounting plate 21 is attached to the mounting part 14 of the lens case 13.
, Whereby the solid-state imaging device 20 is stored in the element storage portion 17 of the lens case 13. At this time, the pressing portion 24 of the filter pressing member 19 is disposed between the rear peripheral edge of the low-pass filter 18 and the front peripheral edge of the solid-state imaging device 20, and elastically presses the low-pass filter 18 toward the front. The low-pass filter 18 is securely and satisfactorily mounted on the filter mounting portion 15.

In this state, the filter holding member 1
9, the skirt-shaped light-shielding portion 25 surrounds substantially the entire outer peripheral side surface of the solid-state imaging device 20.
As a result, it is possible to reliably prevent external light from entering from the side surface of the solid-state imaging device 20, particularly from the side surface of the protection glass 26 of the solid-state imaging device 20, thereby preventing noise from being generated, thereby enabling a clear image to be formed. Obtainable. In this case, the skirt-shaped light shielding portion 25 provided on the filter pressing member 19 is provided.
Since the thickness is formed to be thin, even if the filter holding member 19 and the solid-state imaging device 20 are relatively displaced, the light shielding portion 25 is easily elastically deformed in accordance with the displacement, so that It is possible to reliably and satisfactorily surround substantially the entire outer peripheral side surface of the solid-state imaging device 20.

In this digital camera, the filter holding member 19 has a holding frame mounting portion 23 for elastically mounting the rear end peripheral portion of the low-pass filter 18 and the low-pass filter 18 on the filter mounting portion 15 of the lens case 13. Since the pressing portion 24 for elastically pressing and the skirt-shaped light-shielding portion 25 surrounding the outer peripheral side surface of the solid-state imaging device 20 are integrally formed, the number of parts does not increase, and the lens case is different from the conventional case. Since there is no need to narrow the gap between the solid-state imaging device 13 and the solid-state imaging device 20, it is possible to obtain a low-cost device with good assembling workability.

Further, in this digital camera, the mounting portion 14 of the lens case 13 and the mounting piece 2 of the element mounting plate 21 are provided.
8 is inserted into the flat plate portion 36 of the angle adjusting member 35 that adjusts the tilt angle of the solid-state imaging device 20 by being inserted between and detachable from a direction perpendicular to the axial direction of the screw 30. Since the notch 38 is formed, the angle adjusting member 35 can be inserted and removed between the solid-state imaging device 20 and the lens case 13 simply by loosening the screw 30 without removing it from the screw mounting hole 31 of the lens case 13. Thus, the tilt angle of the solid-state imaging device 20 can be easily adjusted.

In this case, since it is not necessary to completely remove the screw 30 from the screw mounting hole 31 of the lens case 13, the mounting operation of the angle adjusting member 35 can be facilitated, and the screw 30 is screwed into the screw mounting hole 31. Also, when performing a self-tap forming a screw groove on the inner surface of the screw mounting hole 31, dust such as chips generated by the self-tap can be prevented from entering the lens case 13.
Further, since the angle adjusting member 35 has a configuration in which the bent portion 37 is provided at one end of the flat plate portion 36, the angle adjusting member 35 is brought into contact with the outer surface of the mounting portion 14 of the lens case 13, so that the angle adjusting member 35 is provided. 35 can be positioned at a predetermined position in the direction along the notch 38.

[0024]

As described above, according to the present invention, the low-pass filter is mounted on the filter mounting portion at the rear end of the lens case on the light emission side, and the low-pass filter is mounted between the low-pass filter and the solid-state imaging device. A filter holding member for holding the filter is provided, and a light-shielding portion surrounding the outer peripheral side surface of the solid-state imaging device is provided on the filter holding member. This light-shielding portion ensures that external light enters from the end side surface of the solid-state imaging device. It can prevent the generation of noise by preventing it, so that a clear image can be obtained.In particular, since the filter holding member is provided with a light shielding portion, the number of parts does not increase, and In addition, since it is not necessary to narrow the gap between the lens case and the solid-state imaging device, it is possible to obtain a low-priced device with good assembling workability.

In this case, an angle adjusting member for adjusting the tilt angle of the solid-state imaging device is disposed between the device mounting member on which the solid-state imaging device is mounted and the rear end of the lens case on the light emission side, and a screw member is provided. When mounting, the angle adjusting member has a cutout portion that can be inserted and removed from a direction orthogonal to the axial direction of the screw member, so that the screw member can be loosened without removing it from the lens case, The angle adjusting member can be inserted into and removed from the screw member located between the image pickup device and the lens case, whereby the tilt angle of the solid-state image pickup device can be easily adjusted.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing an embodiment in which a photographing apparatus of the present invention is applied to a digital camera.

FIG. 2 is an exploded perspective view of a lens unit provided in the lens body of FIG. 1;

FIG. 3 is an enlarged longitudinal sectional view of a main part in a state where an imaging unit is assembled to the lens unit in FIG. 2;

FIG. 4 is a transverse sectional view of FIG. 3;

FIG. 5 is an enlarged perspective view of the angle adjusting member of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Camera main body part 2 Lens main body part 10 Lens unit part 11 Lens part 12 Imaging part 13 Lens case 14 Mounting part 18 Low-pass filter 19 Filter holding member 20 Solid-state image sensor 21 Element mounting plate 23 Holding frame mounting part 24 Pressing part 25 Light shielding part 30 screw 31 screw mounting hole 35 angle adjustment member 38 notch

Claims (2)

[Claims] A lens unit having a photographing lens in a lens case; and an image pickup unit having a low-pass filter and a solid-state image pickup device, wherein a subject is photographed by the photographing lens of the lens unit through the low-pass filter of the image pickup unit. A photographing apparatus for photographing by forming an image on the solid-state image pickup device, wherein a filter mounting portion for mounting the low-pass filter is provided at a rear end portion of the light exit side of the lens case, and the filter mounting portion is mounted on the filter mounting portion. An imaging apparatus, comprising: a filter holding member that holds the low-pass filter between a low-pass filter and the solid-state imaging device; and a light-shielding portion that surrounds an outer peripheral side surface of the solid-state imaging device. 2. An element mounting member to which said solid-state imaging device is mounted, a screw member for mounting said element mounting member to a rear end portion of said lens case on a light emitting side, and said element mounting member and said lens case. An angle adjusting member arranged between the solid-state imaging device and adjusting a tilt angle of the solid-state imaging device, wherein the angle adjusting member has a cutout portion that is removably inserted into the screw member from a direction orthogonal to an axial direction thereof. The photographing apparatus according to claim 1, further comprising: