JP4016056B1 - Imaging device - Google Patents

Abstract

An object of the present invention is to avoid interference between a shutter integrated with a lens frame and a transmissive photosensor, and to shorten an outer dimension.
A shutter is attached to a second lens frame. The first transmission type photosensor 17 is attached to the inner surface of the outer wall 5a on the photographed object side of the optical block first housing 5, while the second transmission type photosensor 18 is attached to the outer wall 5b on the CCD light receiving unit side. While attaching the 1st light-shielding plate 19 to the surface of the 1st lens frame 11 at the to-be-photographed object side, the 2nd light-shielding plate 20 is provided in the one side of the light-shielding plate attachment member 43, and the light-shielding plate attachment member 43 is attached to the 2nd lens frame 14. Attach to the bottom. In this way, the second light shielding plate 20 is disposed on the opposite side of the shutter 42 from the second lens frame 14 side to avoid interference between the shutter 42 and the second transmissive photosensor 18. In addition, a part of the projection surface of the second transmission type photosensor 18 and the shutter 42 on a plane perpendicular to the optical axis is arranged so as to overlap, thereby shortening the length in the direction perpendicular to the optical axis.
[Selection] Figure 7

Description

  The present invention relates to a lens that is driven during optical zoom.

  Conventionally, an imaging apparatus having an optical zoom function is known. In such an imaging apparatus, it is possible to change the zoom magnification and perform focusing by driving the moving lens frame guided and supported so as to be slidable in the optical axis direction in the optical axis direction. .

  Further, in the imaging apparatus as described above, a transmissive photosensor is widely used to detect an origin serving as a reference when the movable lens frame is moved. The moving lens frame is provided with a light shielding plate for shielding light between the light emitting part and the light receiving part of the transmissive photosensor.

  As an image pickup apparatus having means for detecting an origin serving as a reference when the moving lens frame is moved, there is a lens barrel disclosed in Japanese Patent Laid-Open No. 2002-258138 (Patent Document 1). In this lens barrel, a sleeve that is fixed to the barrel main body and fitted into a guide member extending in the optical axis direction is integrally attached to the lens holding frame, and the photo interrupter light-shielding plate attached to the sleeve and the barrel A reference position detector composed of a photo interrupter mounted on a substrate on the main body side, and a movement amount detector composed of a sensor magnet attached to the sleeve and an MR sensor are provided.

  Then, after the photo interrupter light-shielding plate initially drives the lens holding frame to a reference position where the light interrupting portion and the light receiving portion of the photo interrupter are shielded, the lens holding frame is driven toward the target position, and a sensor magnet The pulse signal output from the MR sensor is counted as the MR sensor moves with respect to the MR sensor, and when the predetermined count value is reached, the stepping motor is stopped to stop the lens holding frame at the target position. ing.

  Thus, in the lens barrel disclosed in Patent Document 1, the photo interrupter light-shielding plate and the sensor magnet for detecting the amount of movement of the lens holding frame are provided on the sleeve formed on the lens holding frame. Thus, the wiring is simplified.

  However, the conventional lens barrel disclosed in Patent Document 1 has the following problems.

  In recent years, a camera module built in a digital camera or a portable device is required not only to have a high zoom ratio and high resolution but also to be miniaturized. Therefore, components such as a motor that is a drive source, a lead screw and a gear that transmit power are mounted with high density.

  Therefore, when the lens barrel disclosed in Patent Document 1 is applied to a small digital camera or a camera module built in a portable device, the photo interrupter light shielding plate and the sleeve provided with the sensor magnet are provided on the sleeve. The means for transmitting power are close. Therefore, while the photo interrupter and the MR sensor are provided around the sleeve, there is a problem that it is difficult to secure a space for providing the photo interrupter light-shielding plate and the sensor magnet in the sleeve itself.

The digital camera or camera module is equipped with a mechanical shutter in order to improve image quality. In particular, when the shutter is fixed to the lens holding frame and the lens holding frame and the shutter are driven integrally, the distance between the shutter and the photo interrupter is set to avoid interference between the shutter and the photo interrupter. There is a problem that it is necessary to make it large, and further miniaturization becomes difficult.
JP 2002-258138 A

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an image pickup apparatus that can avoid interference between a shutter integrated with a lens frame and a transmissive photosensor and can reduce the outer dimensions.

In order to solve the above problems, an imaging apparatus of the present invention provides
A lens that collects light from the subject,
A lens frame that supports the lens so as to be movable in the optical axis direction of the lens;
A transmissive photosensor that detects that the lens frame is located at an origin serving as a reference when moving;
The lens frame includes a light shielding plate that blocks incident light to the light receiving unit in the transmission type photo sensor when the lens frame is located at the origin, and passage of light from the lens toward the opposite object side. And a shutter for controlling the
The light shielding plate is arranged in a space opposite to the lens frame side with respect to the shutter.

  According to the above configuration, the light shielding plate is disposed in a space opposite to the lens frame side with respect to the shutter. Therefore, the transmissive photosensor can be installed outside the movement range of the lens frame and the shutter, and the origin of the lens frame is detected without the shutter and the transmissive photosensor interfering with each other. Can do.

In the imaging device of one embodiment,
The shutter and the light shielding plate are arranged such that at least a part of the projection surface of the shutter on the surface perpendicular to the optical axis and the projection surface of the light shielding plate overlap each other.

  According to this embodiment, the shutter and the light shielding plate are arranged such that at least a part of the projection surface onto the plane perpendicular to the optical axis overlaps with each other. Therefore, the transmissive photosensor and the shutter are arranged so that at least a part of the projection surface of the transmissive photosensor and the projection surface of the shutter overlap each other on a plane perpendicular to the optical axis. The length in the direction perpendicular to the optical axis in the imaging device can be shortened by the overlapping length.

In the imaging device of one embodiment,
The light shielding plate is made of a member different from the lens frame, and is attached and fixed to the lens frame.

  According to this embodiment, the light shielding plate is formed of a member different from the lens frame. Therefore, the light shielding plate arranged in the space opposite to the lens frame side with respect to the shutter is not mounted with higher density components than the shutter, and the structure is sturdy. It can be easily and securely attached and fixed.

In the imaging device of one embodiment,
A second lens having the same optical axis as the optical axis of the lens and different from the lens;
A second lens frame for supporting the second lens so as to be movable in the optical axis direction independently of the lens frame provided with the shutter;
A second transmissive photosensor that detects that the second lens frame is located at a second origin serving as a reference during movement;
The second lens frame includes a second light shielding member that shields light incident on the light receiving portion of the second transmission photosensor when the second lens frame is positioned at the second origin. A board is provided,
The second light shielding plate is arranged such that at least a part of the projection surface of the shutter on the surface perpendicular to the optical axis and the projection surface of the second light shielding plate overlap each other.

  According to this embodiment, the shutter and the second light shielding plate are arranged such that at least a part of the projection surface onto the plane perpendicular to the optical axis overlaps with each other. Therefore, at least a part of the projection surface of the second transmission type photosensor and the projection surface of the shutter on the plane perpendicular to the optical axis is made to have the second transmission type photosensor and the shutter. They can be arranged so as to overlap each other, and the length of the imaging device in the direction perpendicular to the optical axis can be shortened by the overlapping length.

In the imaging device of one embodiment,
The second light shielding plate is disposed in a space opposite to the lens frame side where the shutter is provided with respect to the second lens frame.

  According to this embodiment, the second light shielding plate is disposed in a space opposite to the lens frame side on which the shutter is provided with respect to the second lens frame. Therefore, the second transmissive photosensor can be installed outside the moving range of the second lens frame, and even if the overlapping portion of the moving ranges of the two lens frames is large, the 2 The origin of the two lens frames can be detected without interference between the shutter and the two transmissive photosensors.

  As is apparent from the above, the imaging apparatus of the present invention includes a light shielding plate and a shutter that shield light incident on the light receiving portion of the transmissive photosensor when the lens frame is located at the origin. Since the light shielding plate is disposed in a space opposite to the lens frame side with respect to the shutter, the transmission type photosensor may be installed outside the moving range of the lens frame and the shutter. it can. Therefore, the origin of the lens frame can be detected without the shutter and the transmissive photosensor interfering with each other.

  Furthermore, if the shutter and the light shielding plate are arranged such that at least a part of the projection surface of the shutter and the projection surface of the light shielding plate on a surface perpendicular to the optical axis overlaps each other, the transmission type The photosensor and the shutter can be arranged such that at least a part of the projection surface of the transmissive photosensor on the plane perpendicular to the optical axis and the projection surface of the shutter overlap each other. Therefore, the length in the direction perpendicular to the optical axis in the imaging apparatus can be shortened by the overlapping length.

  Further, the second lens frame independent from the lens frame blocks light incident on the light receiving portion of the second transmission type photosensor when the second lens frame is located at the second origin. A second light shielding plate is provided, and at least a part of the projection surface of the shutter and the projection surface of the second light shielding plate on the surface perpendicular to the optical axis is mutually connected. If the second transmissive photosensor and the shutter are arranged so as to overlap, the projection surface of the second transmissive photosensor and the projection surface of the shutter on a plane perpendicular to the optical axis are arranged. Can be arranged such that at least a part of the two overlap each other. Therefore, the length in the direction perpendicular to the optical axis in the imaging apparatus can be shortened by the overlapping length.

  Further, since the second light shielding plate is disposed in a space opposite to the lens frame side where the shutter is provided with respect to the second lens frame, the second transmission type photosensor is provided. Can be installed outside the moving range of the second lens frame. Therefore, even when the overlapping range of the movement range of the two lens frames is large, the origin of the two lens frames can be detected without the interference between the shutter and the two transmissive photosensors. Can do.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. FIG. 1 is an external perspective view of the imaging apparatus according to the present embodiment. FIG. 2 shows a state in which the imaging device shown in FIG. 1 is disassembled into an optical block, a drive block, and a CCD (Charge Coupled Device) substrate. The imaging device is a small imaging device intended to be built in a portable device.

  As shown in FIGS. 1 and 2, the imaging apparatus includes an optical block 1 including an optical system such as a lens, a drive block 2 including a drive component group for driving a lens frame such as a stepping motor, and a CCD substrate 3. It is roughly composed. The optical block 1 and the drive block 2 are joined by screws 4 and an adhesive, and the CCD substrate 3 is joined by the optical block 1 and an adhesive.

  FIG. 3 shows an overview of the optical block 1. The optical block 1 includes an optical block first housing 5 in which a lens frame and a guide shaft are housed, and an optical block second housing 6 that closes an opening of the optical block first housing 5. Yes. The optical block first housing 5 is provided with a large opening to improve workability during assembly. After the lens frame and the guide shaft are assembled to the optical block first housing 5, the optical block second housing 6 is joined to the periphery of the opening of the optical block first housing 5, so that the optical block first A part of the opening of one housing 5 is closed. The remaining openings in the optical block first housing 5 are closed when the drive block 2 is joined.

  The first optical block 5 supports the first lens 7 on the outer wall 5a closest to the object to be photographed, and the fourth lens 9 on the outer wall 5b closest to the CCD light receiving unit 8 so that the optical axes thereof coincide with each other. It is fixed.

  The first lens frame 11 that supports the second lens 10 has a protruding portion 11a that protrudes in the direction of the optical axis of the second lens 10 (coincides with the optical axes of the first and fourth lenses 7 and 9). The first main guide shaft 12 is inserted into the shaft hole formed in the projecting portion 11a in the optical axis direction. Thus, the first lens frame 11 is guided and supported so as to be slidable in the optical axis direction. In addition, the second lens frame 14 that supports the third lens 13 is a protruding portion that protrudes in the direction of the optical axis of the third lens 13 (coincides with the optical axes of the first, second, and fourth lenses 7, 10, 9). The second main guide shaft 15 is inserted into a shaft hole that is formed in the projecting portion 14a in the optical axis direction. Thus, the second lens frame 14 is guided and supported so as to be slidable in the optical axis direction. Further, the first lens frame 11 and the second lens frame 14 have guide grooves, and the first and second lens frames 11 and 14 are guided by the first main guide by the auxiliary guide shaft 16 passing through the guide grooves. Rotation about the shaft 12 and the second main guide shaft 15 is inhibited.

  A first main guide bearing 12a12b that supports and fixes both ends of the first main guide shaft 12 and a second main body that supports and fixes both ends of the second main guide shaft 15 are provided in the first optical block first housing 5 forming the housing. Main guide bearings 15a and 15b and sub guide bearings 16a and 16b for supporting and fixing both ends of the sub guide shaft 16 are provided.

  FIG. 4 shows a longitudinal section passing through the axial centers of the first main guide shaft 12 and the second main guide shaft 15 in the optical block first housing 5. A first main guide bearing portion 12a, a second main guide bearing 15a, and a sub guide bearing portion 16a are provided on the outer wall 5a of the optical block first housing 5 on the object side. A first main guide bearing portion 12b, a second main guide bearing 15b, and a sub guide bearing portion 16b are provided on the outer wall 5b of the optical block first housing 5 on the CCD substrate 3 side. Here, the first main guide bearings 12a and 12b, the second main guide bearings 15a and 15b, and the sub guide bearings 16a and 16b are through holes formed in the optical block first housing 5, respectively. The center of each through hole is parallel to the optical axis. Then, both ends of the first main guide shaft 12, the second main guide shaft 15 and the sub guide shaft 16 are press-fitted into the first main guide bearing 12a12b, the second main guide bearings 15a and 15b and the sub guide bearings 16a and 16b. The support is fixed.

  As described above, the first main guide bearings 12a and 12b, the second main guide bearings 15a and 15b, and the sub guide bearings 16a and 16b are formed as an integral part. Therefore, it is possible to increase the relative position accuracy by adjusting the mold. That is, it is possible to adjust so that the parallelism between the first main guide shaft 12 and the second main guide shaft 15 is increased. Therefore, even if there are two main guide shafts, the positional accuracy between the lens frames of the first lens frame 11 and the second lens frame 14 is high, and good optical characteristics can be obtained.

  FIGS. 5 and 6 are perspective views showing an overview of the first lens frame 11 and the second lens frame 14 in the optical block first housing 5. FIG. 7 is a plan view showing an overview of the first lens frame 11 and the second lens frame 14. The first lens frame 11 supports the second lens 10, the second lens frame 14 supports the third lens 13, and the optical axes of the second lens 10 and the third lens 13 are the first lens 7 and the first lens 13. It coincides with the optical axis of the four lens 9.

  As shown in FIG. 7, the first and second transmission type photo is provided in the first housing 5 of the optical block as an origin sensor for detecting the origin when the first lens frame 11 and the second lens frame 14 are moved. Sensors 17 and 18 are arranged. First and second light shielding plates 19 and 20 are attached to the first lens frame 11 and the second lens frame 14. The first and second light shielding plates 19 and 20 shield the light between the light emitting portion and the light receiving portion of the first and second transmission type photosensors 17 and 18, thereby the first and second lens frames 11 and 14. Is detected at the origin.

  Further, in the first optical housing 5 of the optical block, the first lens frame 11 and the second lens frame 14 are always pressed against a thrust adding means to be described in detail later, and “when driving by the thrust adding means” The 1st press spring 21 and the 2nd press spring 22 for suppressing generation | occurrence | production of "rare" are arrange | positioned. In this case, the first and second pressing springs 21 and 22 are disposed between the optical block first housing 5 and the first and second lens frames 11 and 14, and the first pressing spring 21 has a first While the first main guide shaft 12 is inserted, the second main guide shaft 15 is inserted into the second pressing spring 22.

  8 and 9 show the drive block 2 connected to the optical block 1. The drive block 2 includes a drive block first housing 25 and a drive block second housing 26. The drive block first housing 25 and the drive block second housing 26 include a first motor 27, a second motor 28, a first gear 29, a second gear 30, a first lead screw 31 and a second lead screw 32. The drive block first housing 25 and the drive block second housing 26 are fastened to each other with screws 33.

  The first gear 29, the second gear 30, the first lead screw 31, and the second lead screw 32 are supported so as to be rotatable around their respective central axes. The first motor 27 is a stepping motor, and an output gear 34 is attached to its output shaft. The output gear 34 meshes with the first gear 29, and the first gear 29 meshes with the input gear 35 of the first lead screw 31. The output gear 36 of the first lead screw 31 is screwed with a plate-shaped first thrust plate 37 having a female thread in the through hole, and the first thrust plate 37 is engaged with the first lens frame 11 on the object side. It comes to contact from. Here, since the central axis of the female screw in the first thrust plate 37 is perpendicular to the contact surface with the first lens frame 11, when the first lead screw 31 is rotated, the first thrust plate 37 is in the first thrust plate 37. The single lead screw 31 moves in parallel with the central axis. Further, since the first lead screw 31 is disposed in parallel with the optical axis of the lens system, the rotation of the first motor 27 becomes a thrust in the optical axis direction of the first lens frame 11.

  The second motor 28, the output gear 38 of the second motor 28, the second gear 30, the input gear 39 of the second lead screw 32, the output gear 40 of the second lead screw 32, the second thrust plate 41 and the second lens frame. 14 also has the same configuration as that of the first motor 27 to the first lens frame 11 described above. However, the second thrust plate 41 is in contact with the second lens frame 14 from the CCD substrate 3 side. That is, the thrust adding means includes the first motor 27, the output gear 34 of the first motor 27, the first gear 29, the input gear 35 of the first lead screw 31, the output gear 36 of the first lead screw 32, and the first gear. A thrust plate 37, a second motor 28, an output gear 38 of the second motor 28, a second gear 30, an input gear 39 of the second lead screw 32, an output gear 40 of the second lead screw 32, and a second thrust plate 41. Is pointed to.

  In the image pickup apparatus according to the present embodiment, the shutter 42 is fixed to the second lens frame 14, and the second lens frame 14 and the shutter 42 are integrally driven by the second motor 28.

  By the way, in the high-magnification and small-sized imaging device, the closest approach distance between the first lens frame 11 and the second lens frame 14 is short. Moreover, as shown in FIG. 7, the overlapping portions of the movement ranges of the first lens frame 11 and the second lens frame 14 are large. Therefore, when the first and second transmission photosensors 17 and 18 are installed between the first lens frame 11 and the second lens frame 14, the first and second transmission photosensors 17 and 18 The first and second lens frames 11 and 14 and the shutter 42 interfere with each other.

  Therefore, in the present embodiment, as shown in FIG. 7, the first and second transmission type photosensors 17, 18 have a movement range of the first lens frame 11 and a movement range of the second lens frame 14. It is installed outside each movement range that does not overlap. Here, the moving range is a range through which the outer shapes of the first and second lens frames 11 and 14 including the shutter 42, the second lens 10, and the third lens 13 move. That is, the first transmission type photosensor 17 that detects the origin of the first lens frame 11 is attached and fixed to the inner surface of the outer wall 5 a closest to the photographed object in the optical block first housing 5. The second transmission type photosensor 18 for detecting the origin of the second lens frame 14 is attached and fixed in the outer wall 5b closest to the CCD light receiving unit 8.

  Here, the shutter 42 is fixed to the surface of the second lens frame 14 on the CCD substrate 3 side. Therefore, as shown in FIGS. 7 and 10, the second light shielding plate 20 is provided on one side of the main body having a U-shaped horizontal section, and the light shielding plate attachment member 43 is provided with a mounting plate 44 on the other side. Are formed separately from the second lens frame 14 and the shutter 42. Then, the attachment plate 44 of the light shielding plate attachment member 43 is attached to the bottom of the second lens frame 14. In this way, the second light shielding plate 20 is disposed in a space opposite to the second lens frame 14 side with respect to the shutter 42 around the side of the second lens frame 14 and the side of the shutter 42. By doing so, it becomes possible to detect the origin of the second lens frame 14 without the shutter 42 and the second transmissive photosensor 18 interfering with each other.

  When the second light shielding plate 20 is disposed in the space on the second lens frame 14 side with respect to the shutter 42, the projection surface of the second transmission type photosensor 18 on the surface perpendicular to the optical axis and the shutter 42. If the second transmissive photosensor 18 is not installed so as not to overlap with the projection surface of the second transmissive photosensor 18 and the shutter 42 when the second lens frame 14 is moved in the optical axis direction. Interference will occur.

  On the other hand, when the second light shielding plate 20 is arranged as in the present embodiment, the second light shielding plate 20 is located closer to the second transmission photosensor 18 than the shutter 42. Accordingly, the projection surface of the shutter 42 onto the surface perpendicular to the optical axis and the projection surface of the second light shielding plate 20 can be configured to overlap each other. And when comprised in this way, it can arrange | position so that the projection surface of the 2nd transmissive photosensor 18 and the projection surface of the shutter 42 may overlap on a surface perpendicular | vertical to an optical axis. . Therefore, the outer shape of the imaging apparatus can be shortened by the overlapping length.

  In the first lens frame 11, the first light shielding plate 19 is formed in a space opposite to the second lens frame 14 side where the shutter 42 is fixed with respect to the first lens frame 11. . Therefore, the first transmissive photosensor 17 can be disposed outside the moving range of the second lens frame 14, and interference between the shutter 42 and the first transmissive photosensor 17 can be avoided. The first transmissive photosensor 17 is also arranged so that a part of the projection surface of the first transmissive photosensor 17 on the surface perpendicular to the optical axis and the projection surface of the shutter 42 overlap each other. . Therefore, the outer shape of the imaging apparatus can be shortened by the overlapping length.

  As described above, in the present embodiment, among the first lens 7, the second lens 10, the third lens 13, and the fourth lens 9 arranged so as to have the same optical axis, the zoom magnification is changed and focused. The second lens 10 and the third lens 13 that perform the above are supported by the first lens frame 11 and the second lens frame 14 so as to be movable in the optical axis direction. Further, a shutter 42 is attached and fixed to the second lens frame 14 so that the second lens frame 14 and the shutter 42 are driven integrally.

  Then, the first transmission type photosensor 17 for detecting the origin of the first lens frame 11 is attached and fixed to the inner surface of the outer wall 5a closest to the photographed object in the optical block first housing 5. On the other hand, the second transmission type photosensor 18 for detecting the origin of the second lens frame 14 is attached and fixed in the outer wall 5 b closest to the CCD light receiving unit 8. Further, when the first lens frame 11 is located at the origin, the first light shielding plate 19 that shields light between the light emitting portion and the light receiving portion of the first transmission photosensor 17 is taken in the first lens frame 11 as described above. It is attached to the surface on the object side. On the other hand, when the second lens frame 14 is located at the origin, the second light-shielding plate 20 that shields light between the light-emitting portion and the light-receiving portion of the second transmissive photosensor 18 is used. The light-shielding plate attachment member 43 is provided on one side, and the light-shielding plate attachment member 43 attachment plate 44 is attached to the bottom of the second lens frame 14. In this way, the second light shielding plate 20 is disposed in a space on the opposite side of the shutter 42 from the side of the second lens frame 14 and the side of the shutter 42 and on the side opposite to the second lens frame 14 side. ing.

  Therefore, as shown in FIG. 7, even when the overlapping range of the movement range of the first lens frame 11 and the second lens frame 14 is large, the origin of the second lens frame 14 is set to the shutter 42 and the second lens frame 14. The detection can be performed without the two-transmissive photosensor 18 interfering with each other and without the shutter 42 and the first transmissive photosensor 17 interfering with each other.

  Further, the projection plane of the shutter 42 on the plane perpendicular to the optical axis and the projection plane of the second light shielding plate 20, that is, the projection plane of the second transmissive photosensor 18 on the plane perpendicular to the optical axis, A part of the shutter 42 and the projection surface can be arranged so as to overlap each other. Therefore, the length of the imaging device in the direction perpendicular to the optical axis can be shortened by the overlapping length.

  Further, the projection plane of the shutter 42 on the plane perpendicular to the optical axis and the projection plane of the first light shielding plate 19, that is, the projection plane of the shutter 42 on the plane perpendicular to the optical axis and the first transmission type photo. A part of the projection surface of the sensor 17 can be arranged so as to overlap each other. Therefore, the length of the imaging device in the direction perpendicular to the optical axis can be shortened by the overlapping length.

  In the above embodiment, the second light shielding plate 20 attached to the second lens frame 14 is formed of a member different from the second lens frame 14. Here, there is a method of attaching the second light shielding plate 20 to the shutter 42 instead of attaching the second light shielding plate 20 to the second lens frame 14. However, since the mechanical components are mounted in the shutter 42 with high density and the shutter 42 moves integrally with the second lens frame 14, the outer dimensions cannot be increased. Moreover, since it is calculated | required that it is lightweight, the outer wall of the shutter 42 is thin and it is difficult to attach the 2nd light shielding plate 20. FIG. Therefore, in the present embodiment, the second light shielding plate 20 is provided on the second lens frame 14.

  However, it is difficult to integrally mold the second lens frame 14, a member that goes around the side of the shutter 42, and the second light shielding plate 20. Therefore, in the present embodiment, the second light shielding plate 20 is easily formed by configuring the light shielding plate mounting member 43 as a separate member from the second lens frame 14.

It is an external appearance perspective view in the imaging device of this invention. It is a figure which shows the state which decomposed | disassembled the imaging device shown in FIG. 1 into the optical block, the drive block, and the CCD board | substrate. It is a figure which shows the general appearance of the optical block in FIG. It is a longitudinal cross-sectional view in the optical block 1st housing | casing in FIG. It is a perspective view which shows the external appearance of the 1st, 2nd lens frame in the said optical block 1st housing | casing. FIG. 6 is a perspective view showing an overview of first and second lens frames different from FIG. 5. It is a top view which shows the general view of the 1st, 2nd lens frame in the said optical block 1st housing | casing. It is a perspective view which shows the said drive block connected to the said optical block. It is the rear view seen from the said CCD board | substrate side which shows the said drive block connected to the said optical block. It is explanatory drawing of the attachment method of the 2nd light-shielding plate with respect to the said 2nd lens frame.

Explanation of symbols

1 ... optical block,
2 ... Drive block,
3 ... CCD substrate,
5 ... Optical block first housing,
5a, 5b ... the outer wall of the optical block first housing 5,
6 ... Optical block second housing,
7 ... 1st lens,
8 ... CCD light receiving part,
9 ... Fourth lens,
10 ... second lens,
11 ... 1st lens frame,
11a: a protruding portion of the first lens frame 11,
12 ... 1st main guide shaft,
12a, 12b ... 1st main guide bearing part,
13 ... Third lens,
14 ... Second lens frame,
14a: a protruding portion of the second lens frame 14,
15 ... second main guide shaft,
15a, 15b ... second main guide bearing,
16 ... Sub-guide shaft,
16a, 16b ... sub guide bearing part,
17 ... 1st transmission type photo sensor,
18 ... second transmission type photosensor,
19 ... 1st light-shielding plate,
20 ... the second shading plate,
21 ... 1st press spring,
22 ... second pressing spring,
25 ... Drive block first housing,
26 ... second housing of the drive block,
27. First motor,
28 ... second motor,
29 ... 1st gear,
30 ... Second gear,
31 ... 1st lead screw,
32 ... second lead screw,
34: The output gear of the first motor 27,
35 ... The input gear of the first lead screw 31;
36 ... the output gear of the first lead screw 31,
37. First thrust plate,
38 ... the output gear of the second motor 28,
39 ... The input gear of the second lead screw 32,
40 ... the output gear of the second lead screw 32,
41 ... second thrust plate,
42. Shutter,
43: A light shielding plate mounting member.

Claims (5)

A lens that collects light from the subject,
A lens frame that supports the lens so as to be movable in the optical axis direction of the lens;
A transmissive photosensor that detects that the lens frame is located at an origin serving as a reference when moving;
The lens frame includes a light shielding plate that blocks incident light to the light receiving unit in the transmission type photo sensor when the lens frame is located at the origin, and passage of light from the lens toward the opposite object side. And a shutter for controlling the
The imaging apparatus, wherein the light shielding plate is disposed in a space opposite to the lens frame side with respect to the shutter. The imaging device according to claim 1,
The shutter and the light shielding plate are arranged such that at least a part of a projection surface of the shutter on a surface perpendicular to the optical axis and a projection surface of the light shielding plate overlap each other. Imaging device. In the imaging device according to claim 1 or 2,
The imaging apparatus, wherein the light shielding plate is made of a member different from the lens frame, and is fixed to the lens frame. In the imaging device according to claim 2 or 3,
A second lens having the same optical axis as the optical axis of the lens and different from the lens;
A second lens frame for supporting the second lens so as to be movable in the optical axis direction independently of the lens frame provided with the shutter;
A second transmissive photosensor that detects that the second lens frame is located at a second origin serving as a reference during movement;
The second lens frame includes a second light shielding member that shields light incident on the light receiving portion of the second transmission photosensor when the second lens frame is positioned at the second origin. A board is provided,
The second light shielding plate is disposed so that at least a part of the projection surface of the shutter on the surface perpendicular to the optical axis and the projection surface of the second light shielding plate overlap each other. An imaging device that is characterized. The imaging apparatus according to claim 4,
The imaging apparatus, wherein the second light shielding plate is disposed in a space opposite to the lens frame side where the shutter is provided with respect to the second lens frame.

Images