JP2021036266A - Lens device - Google Patents

Abstract

To provide an imaging apparatus which enables the miniaturization of a switching mechanism by alternately arranging filters on the front and rear surfaces of a holding component and can be manufactured at low cost.SOLUTION: An imaging apparatus includes a holding component, a plurality of openings which are provided in the holding component, and a plurality of filters which are arranged so as to cover the openings and fixed to the holding component. The openings are arranged on an optical axis by the drive of the holding component, and adjacent filters are alternately arranged on the front and rear surfaces of the holding component. A surface perpendicular to the optical axis has an area where the filters are overlapped with each other between the adjacent filters.SELECTED DRAWING: Figure 5

Description

The present invention relates to an imaging device provided with an optical filter switching mechanism used in a photographing lens device.

A conventional imaging device includes a plurality of optical filters, a holding component for arranging and holding the filters in a swastika shape, and a drive mechanism for driving the holding component, and drives the holding component according to the application to obtain a desired optical filter. An imaging device equipped with a switching mechanism capable of arranging the swastika at an optical path position has been published (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2015-141383

However, in the prior art disclosed in Patent Document 1 above, it is possible to minimize the area of the holding component in the plane perpendicular to the optical axis, but due to the layout of the optical path and the rotation axis, the optical path may be used. On the other hand, there is a problem that the holding parts protrude in two directions, one up and down and one left and right. In that case, the layout of the device that adopts the mechanism equipped with this holding part is subject to design restrictions due to the protrusion in two directions, the effect of miniaturization of the holding part is limited, and when the necessary structures of the device or mechanism are piled up, It may not always be the minimum size.

Therefore, an object of the present invention is to provide an image pickup apparatus that can be manufactured at low cost while enabling miniaturization as a switching mechanism by alternately arranging filters on the front surface and the back surface of the holding component.

In order to achieve the above object, the imaging device according to the present invention is
It comprises a holding part, a plurality of openings provided in the holding part, and a plurality of filters arranged to cover the openings and fixed to the holding part.
The openings are arranged on the optical axis by driving the holding component, and adjacent filters are alternately arranged on the front surface and the back surface of the holding component, and the filters overlap between the adjacent filters on the plane perpendicular to the optical axis. It is characterized by having a vertical region.

According to the present invention, by alternately arranging the filters on the front surface and the back surface of the holding component, it is possible to provide an image pickup apparatus that can be manufactured at low cost with a miniaturized switching mechanism.

It is an overall perspective view of the filter switching apparatus which concerns on embodiment of this invention. It is a front view of the turret unit which concerns on embodiment of this invention. It is a partial decomposition perspective view of the filter switching device in the conventional filter arrangement which concerns on embodiment of this invention. It is a front view of the turret in the conventional filter arrangement which concerns on embodiment of this invention. It is a partial decomposition perspective view of the filter switching apparatus which concerns on embodiment of this invention. It is a front view of the turret having a rectangular opening shape which concerns on embodiment of this invention. FIG. 5 is a front view of a turret having a substantially circular opening shape according to an embodiment of the present invention. It is a front view of the holding component which drives straight forward which concerns on embodiment of this invention.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

The description will focus on the parts related to the present invention, and the parts not directly related to the invention are omitted.

The miniaturization of the filter switching device according to the embodiment of the present invention will be described with reference to FIGS. 1 to 7.

FIG. 1 is an overall perspective view showing the appearance of the filter switching device 10 in the present invention.

The turret units 1, 2, and 3 are mounted on the fixing member 6, and the turret units 1, 2, and 3 are provided with position detecting means 51.

FIG. 2 is a front view showing a state in which the turret unit 1 is incorporated in the filter switching device 10.

The base 7 is provided with a rotating shaft 61 for rotationally supporting the turret 11, and different types of optical filters 12a to 12d are adhesively held in the openings of the turret 11. The turret 11 is provided with two protrusions 124, and the protrusions 124 pass through the position detecting means 51 so that the rotational position of the turret 11 can be accurately detected.

A gear is provided on the upper part of the turret unit 1 at the tip of the shaft of the motor 50 and the motor 50, and by engaging with the outer peripheral gear provided on the outer peripheral portion of the turret 11, the driving force of the motor 50 is transmitted via the gear. It is transmitted to the turret 11. With this configuration, the turret 11 can be driven according to the application, and the desired optical filter among the optical filters 12a to 12d mounted on the turret 11 can be switched to the optical path 5 and arranged.

Looking at the arrangement in FIG. 2, the holding component protrudes in only one direction downward with respect to the optical axis, minimizing the influence on the layout of the device. On the other hand, the component that predominantly determines the size of the turret unit 1 in the plane in the direction perpendicular to the optical axis is the turret 11. Therefore, in order to reduce the size of the turret unit 1, it is essential to reduce the diameter of the turret 11.

FIG. 3 is a partially exploded perspective view of the filter switching device 10, and FIG. 3 describes an assembly procedure.

As a preliminary preparation for assembly, the optical filters 12a to 12d are adhesively fixed to the four openings provided in the turret 11. After the preparation is completed, the turret unit 1 is assembled. First, the motor 50 is attached to the base 7, and the turret 11 to which the optical filters 12a to 12d are adhered and held is inserted into the rotating shaft 61 provided on the base 7. On it, the cover member 8 to which the position detecting means 51 mounted on the cable (not shown) is attached is attached. Finally, the filter switching device 10 is completed by attaching the turret unit 1 to the fixing member 6.

FIG. 4 is a front view showing a state in which the optical filters 12a to 12d are mounted on the four rectangular openings provided in the conventional turret 11.

As shown in FIG. 2, in order to reduce the size of the turret unit 1, it is necessary to reduce the diameter of the turret 11. When trying to reduce the diameter of the turret 11, it is necessary to bring the mounted optical filters 12a to 12d as close to the center 123 of the turret as possible. When the optical filter is rectangular, the arrangement is such that the diameter of the turret 11 can be reduced when the corners of the optical filters 12a to 12d close to the center 123 of the turret are closest to each other.

Further, as a method of making the diameter of the turret 11 smaller than the above arrangement, the optical filters 12a to 12d can be made more attractive by adding chamfers to the corners of the optical filters 12a to 12d near the center 123 as shown in FIG. It is closer to the center 123 of the turret. As a result, the diameter of the turret 11 can be made smaller.

However, when chamfering is added to the optical filters 12a to 12d, the diameter of the turret 11 can be reduced to the limit, but the processing steps of the optical filters 12a to 12d increase, which leads to an increase in the cost of the optical filters 12a to 12d. It is expected that.

Therefore, as an implementation system of the present invention, FIGS. 5 and 6 show an arrangement in which the cost of the optical filter can be suppressed while reducing the size of the turret unit. FIG. 5 is a partially disassembled perspective view of the turret unit 2, and the assembly procedure will be described with reference to FIG. As a preliminary preparation for assembly, the optical filters 22a to 22d are adhesively fixed to the four openings provided in the turret 21. As the optical filter, the optical filters 22b and 22d are arranged from the front surface of the turret 21, and the optical filters 22a and 22c are arranged from the back surface. The procedure for assembling the turret unit 1 after the completion of the preliminary preparation is the same as that in FIG.

FIG. 6 is a front view showing a state in which the optical filters 22a to 22d are mounted on the four rectangular openings provided in the turret 21.

In order to reduce the diameter of the turret 21, optical filters 22b and 22d are arranged in two openings from the surface 221 of the turret. Optical filters 22a and 22c are arranged in the remaining two openings from the back surface 222 of the turret, and adjacent optical filters 22a to 22d are alternately arranged on the front surface and the back surface of the turret 21. As a result, a part of the corner portion near the center 223 of the turret has a region overlapping between adjacent optical filters with the turret 21 sandwiched in the optical axis direction, and the diameter of the turret 21 can be reduced. It becomes.

Further, by alternately arranging the turrets 21 on the front surface and the back surface and superimposing them in the optical axis direction, the optical filters 22a to 22a to the same arrangement as when chamfering is not added to the corners of the optical filters 22a to 22d. The 22d can be brought closer to the center 223 of the turret. As a result, it is possible to reduce the size of the turret unit 2 while suppressing the cost.

FIG. 7 is a front view showing a state in which the optical filters 32a to 32d are mounted on the four substantially circular openings provided in the turret 31.

In order to reduce the diameter of the turret 31, optical filters 32b and 32d are arranged in two openings from the surface 321 of the turret. Optical filters 32a and 32c are arranged in the remaining two openings from the back surface 322 of the turret, and adjacent optical filters 32a to 32d are alternately arranged on the front surface and the back surface of the turret 31. As a result, a part of the outer peripheral portion of the optical filters 32a to 32d sandwiches the turret 31 in the optical axis direction and has an overlapping region between the adjacent optical filters, so that the diameter of the turret 31 can be reduced. It becomes.

Hereinafter, miniaturization of the filter switching device according to the embodiment of the present invention will be described with reference to FIG.

FIG. 8 is a front view showing a state in which the optical filters 42a to 42d are mounted on the four rectangular openings provided in the holding component 41 that drives in a straight line.

A gear is provided on the end face of the holding component 41, and a driving force is transmitted by engaging with a driving mechanism (not shown), so that the holding component 41 is driven in a linear motion. With this configuration, the holding component 41 can be driven, and the desired optical filter among the optical filters 42a to 42d mounted on the holding component 41 can be switched to the optical path 5 and arranged according to the application.

Further, with the miniaturization of the filter switching device, in order to shorten the total length of the holding component 41, the optical filters 42b and 42d are arranged at two openings from the front side 421 of the holding component. Optical filters 42a and 42c are arranged in the remaining two openings from the back side 422 of the holding component, and adjacent optical filters 42a to 42d are alternately arranged on the front surface and the back surface of the holding component 41. As a result, a part of the outer peripheral portion of the optical filters 42a to 42d sandwiches the holding component 41 in the optical axis direction and has an overlapping region between the adjacent optical filters, so that the total length of the holding component 41 can be shortened. Is possible.

1,2,3 turret unit, 4 linear motion unit, 5 optical path,
6 fixing member, 7 base, 8 cover member,
10,20 filter switching device, 11,21,31 turret,
12a, 12b, 12c, 12d optical filter,
22a, 22b, 22c, 22d optical filter,
32a, 32b, 32c, 32d optical filter,
42a, 42b, 42c, 42d optical filter,
41 Retaining parts, 50 motors, 51 position detecting means,
61 rotating shaft, 121,221,321 front side of turret,
122,222,322 Behind the turret,
123,223,323 Center of turret,
124 protrusions, 421 front side of holding parts,
422 Back side of holding parts

Claims (3)

It includes a holding component, a plurality of openings provided in the holding component, and a plurality of filters arranged so as to cover the openings and fixed to the holding component, and the openings are placed on the optical axis by driving the holding component. An imaging device that is arranged and adjacent filters are alternately arranged on the front surface and the back surface of a holding component, and has a region in which filters overlap between adjacent filters on a surface perpendicular to the optical axis. The imaging device according to claim 1, wherein the holding component is substantially circular or rectangular. The imaging device according to claim 1, wherein the opening shape of the holding component is substantially circular or rectangular.