JP3078032B2 - Camera and camera imager support structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is, camera, For more information, moth
Turtle having a lens group movable along the id member
It is about LA .

[0002]

2. Description of the Related Art In recent years, with respect to a video camera using an imager of a solid-state image pickup device, which has been remarkably popularized, and a lens barrel structure for a still camera, there have been proposed a large number of devices capable of achieving compactness, high precision and the like. ing. For example,
FIG. 4 is a longitudinal sectional view showing an example of a lens barrel to which an imager of a conventional camera is mounted.
It mainly comprises a first and second lens unit, an aperture unit, a third and fourth lens unit, and an imager unit.

[0003] The first and second lens units are provided with a support frame 5.
1, a first group lens 52 fixed to the support frame 51, and a second group lens 53 slidably guided. Note that the second group lens 53 is held by the moving frame 55,
The movable frame 55 is slidably guided and supported by a guide shaft 54 supported by the support frame 51. The diaphragm unit is composed of a diaphragm 57 supported by a diaphragm support frame 56. Further, the third and fourth group lens unit section includes a third group lens 59 fixed to the support frame 58 and a fourth group lens 60 slidably guided. In addition,
The fourth group lens 60 is held by a moving frame 62, and the moving frame 62 is slidably guided and supported by a guide shaft 61 supported by a support frame 58. Still further, the imager unit includes an imager 65 and an optical LPF.
(Low pass filter) 64 and an imager support frame 63 for positioning and supporting them. In the present lens barrel configured as described above, the second lens group 53 and the fourth lens group 60 are moved forward and backward in the optical axis direction at the time of photographing, and the object is placed on the image forming surface (photoelectric conversion surface) of the imager 65. An image is formed and photographing is performed.

As another conventional lens barrel, the structure of an image pickup optical system of an image pickup apparatus disclosed in Japanese Patent Application Laid-Open No. 2-46434 is such that a relay lens group and a guide shaft are fixed to a holding frame. The zoom lens group, the finder optical system, and the imager are attached to the guide shaft.

[0005]

In the lens barrel of the above mentioned FIG. 4 [0008], a guide shaft 54, 61 of the movable frame 55 and 62
The mating part requires a certain mating length due to the accuracy of the posture of the frame.
And

[0006] Such a frame is simply arranged in the optical axis direction.
When a lens barrel is configured, the dimension in the optical axis direction increases.
This increases the size of the camera .

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a camera which achieves high precision and compactness.

[0008]

The camera according to the present invention comprises:
Imager that photoelectrically converts a subject image and outputs an imaging signal
And an optical member fixed to the front side of the imager;
A lens group for forming an object image on the imager
When a plurality of guides members for guiding along the lens group in the optical axis direction, the holding the lens group
A given guide member of the plurality of guide members
Frame having a fitting portion movably fitted to the lens frame
And the fitting portion of the lens frame is the guide member.
So that it can enter the side of the optical member
It is characterized in that it has been configured.

[0009]

[Action] The fitting portion of the lens frame is moved along the guide member.
The optical member is configured to be able to enter the side surface portion .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. FIG. 1 is a longitudinal sectional view of a two-unit zoom type lens barrel mounted on an imager used in a camera showing a first embodiment of the present invention. FIG. 2 is a sectional view showing an imager supporting state of the imager supporting frame. As shown in FIG. 1, the main structure of the lens barrel of the present camera includes an imager support structure, a shaft, a light-shielding frame, and a lens frame. The imager support structure holds an imager 1 of a solid-state image sensor for converting a subject image into an image pickup signal at a predetermined position, and the imager 1 is an imager.
It is fitted into predetermined fitting portions 2a and 2b of an imager support frame 2 as a jaw support member (see FIG. 2), and is fixed by a mounting plate 3 also serving as a heat sink. An optical LPF 5 is fixed to the support frame 2 on the front surface of the imager 1, and a F for extracting the output of the imager 1 is mounted on the back surface of the mounting plate 3.
PC (Flexible Printed Circuit Board) 4 or PCB
(Printed circuit board) is fixed by screws. The imager support frame 2 has a plurality of guide members 8 constituting a shaft portion.
And a fitting hole 2d having a predetermined length.

The light-shielding frame portion is a light-shielding frame 6 which is a lens barrel structure member which is screwed to the imager support frame 2 and is integrally extended over the entire area of the arrangement of all the lens units in the optical axis direction. And a shaft fixing plate 7 which is screwed to the light shielding frame 6 and fixes the reference shaft 8 and the guide shaft 9 to each other. The shaft fixing frame 7 has a recess 7 for fixing the reference shaft 8 at a fixed position.
a and a concave portion 7b for fixing the guide shaft 9 at a fixed position. Further, the lens frame portion includes a front group moving frame 10 for holding the front group lens frame 12 for the front group lens 14.
And a rear group moving frame 11 for holding the rear group lens frame 13 for the rear group lens 15. And the front group moving frame 10 is
A circular hole 10 which is a guide portion and is separated by a predetermined distance;
a and 10b are fitted into the reference shaft 8, and a notch 10c facing the reference shaft 8 is fitted into the guide shaft 9 and supported so as to be able to advance and retreat in the optical axis direction. Similarly, the rear group moving frame 11 is a guide portion thereof and has circular holes 11a,
11b is fitted into the reference shaft 8, and a notch 11c facing the reference shaft 8 is fitted into the guide shaft 9 and supported so as to be able to advance and retreat in the optical axis direction.

In the lens barrel constructed as described above, the front group moving frame 10 and the rear group moving frame 11 are moved in the optical axis direction by a driving device (not shown) at the time of photographing.
A subject image is formed on an image forming surface (photoelectric conversion surface) of the imager 1, and an image pickup signal is output from the imager 1.

As described above, in the lens barrel of the camera of the present embodiment, the integrated reference shaft 8 for guiding the front and rear group moving frames 10 and 11 is provided on the imager support frame 2 by the guide shaft 9. The guide shaft 9 is also supported by the imager support frame 2 with a required holding strength and a required accuracy in the fitting hole 2d. With this support structure, the imager 1 and the lens groups 14 and 15 supported on the shafts 8 and 9 via moving frames 10 and 11, respectively.
And relative position accuracy such as eccentricity and tilt are improved. Further, only the guide shaft 9 is relatively deeply fitted in the fitting hole 2d.
And the other reference shaft 8 does not require a particularly deep fitting hole, and is supported by the concave portion 2c. Therefore, the base end of the reference axis 8 on the imager 1 side (the side portion of the optical LPF) can take a sufficient space. And front and rear group moving frame 1
Circular holes 10a provided on the reference shaft 8 side of 0, 11
10b and 11a and 11b require a predetermined fitting length in view of the posture accuracy of the frame body, but the fitting portion can enter using the space, and the entire lens barrel can be downsized.

Further, the light shielding frame 6 in this embodiment is
At the same time as having a light-shielding function for each of the lens groups 14 and 15, it also functions as a member that gives rigidity to the lens barrel, increases the strength of the lens barrel, and supports the reference shaft 8 and the guide shaft 9. It also functions as a holding member for the shaft fixing frame 7, which is a regulating member. In this way, it contributes to making the lens barrel compact and reducing the number of constituent parts. In the above embodiment, the guide shaft 9 is fitted into the fitting hole 2d of the imager support frame 2. However, the reference shaft 8 is fitted into the fitting hole 2d. It may be configured. In the above embodiment, the light-shielding frame 6 has the light-shielding function and the function as the strength member of the lens barrel. Only one of the functions may be provided. However, when the light-shielding frame 6 has only the light-shielding function, it is necessary to adopt a structure in which the reference shaft 8 and the guide shaft 9 are completely held in the imager support frame 2. It is necessary to adopt a structure in which the supporting holes 9 are fixedly supported by supporting holes having a fitting length of a predetermined accuracy.

As described above, the lens barrel of the camera of this embodiment is
The number of constituent parts is small, and therefore, mounting position errors such as eccentricity and inclination of each of the lens groups 14 and 15 with respect to the imager 1 due to accumulation of parts can be suppressed to an extremely small amount. In addition, it is possible to reduce the number of assembling steps, for example, because the position adjustment of the imager, which has been conventionally performed, becomes unnecessary. Therefore, it is advantageous in terms of cost.

FIG. 3 is a longitudinal sectional view of an imager-mounted lens barrel used in a camera according to a second embodiment of the present invention. The lens barrel of the camera according to the present embodiment has an imager support frame 2.
2 is provided with a mounting portion for an actuator for driving the lens group frame and for driving the diaphragm. As shown in FIG. 3, the main structure of the present lens barrel comprises an imager support structure, a shaft, and a lens frame. The imager support structure holds the imager 21 of the solid-state imaging device at a predetermined position by an imager support frame 22 which is an imager support member. Reference numeral 22 denotes an optical LPF 23 fixed to the front surface of the imager 21. The shaft portion includes a reference shaft 24, which is a guide member whose one end is supported by the support frame 22, and a guide shaft (not shown). The lens frame portion includes a front group moving frame 25 and a rear group moving frame 26 that respectively hold a front group lens or a rear group lens. Then, each moving frame 25, 26
The guide portions 25a and 26a are guided by the reference shaft 24 and advance and retreat in the optical axis O direction.

The imager support frame 22 is integrally provided with support portions for actuators 27 and 29 for driving the movable frames 25 and 26 and a support portion for the actuator 31 for driving the diaphragm. ing. The actuator
The actuator 27 drives the moving frame 25 via the driving force transmitting member 28, and the actuator 29 drives the moving frame 26 via the driving force transmitting member 30. Also, the actuator 31 drives the throttle unit via the driving force transmitting member 32. As described above, the lens barrel of the camera according to the present embodiment does not require a separate mounting portion for each actuator, and the number of components of the camera can be further reduced.

It should be noted that the lens barrel of the camera of the present invention is not limited to the two-unit lens system as described above,
The present invention is also applicable to a lens barrel of a four-group lens. Further, the present invention can be applied to a video camera using an imager, a still video camera, or the like.

[0019]

As described above, the camera of the present invention has a lens
The fitting part of the frame is located along the side of the optical member along the guide member.
Minutes so that it can be
And downsizing can be achieved .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an imager-mounted lens barrel used in a camera showing a first embodiment of the present invention.

FIG. 2 is a view showing an imager support state of an imager support frame of the lens barrel of FIG. 1;

FIG. 3 is a vertical sectional view of an imager-mounted lens barrel used in a camera showing a second embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a four-group zoom lens barrel mounted on an imager used in a camera showing a conventional example.

[Explanation of symbols]

2, 22 ... Imager support frame (Imager support member) 6 ... Light-shielding frame (Barrel structure member) 8, 24 ... Reference axis ( Guide member 9) Guide shaft (guide member) 14 Front group lens group (lens group) 15 Rear group lens group (Lens group)

Claims (1)

(57) [Claims] 1. An image pickup signal is output by subjecting a subject image to photoelectric conversion.
Imager , an optical member fixed to the front side of the imager, and a lens group for forming an image of a subject on the imager.
When, the lens group, a plurality of guide members for guiding along the optical axis direction, holding the lens group, the plurality of guide members
Is movably fitted to the predetermined guide member.
Comprising a lens frame having a fitting portion that, the fitting portion of the lens frame, said guide member
So that it can enter the side of the optical member
Camera characterized in that it is configured.