JP2023073613A - Lens device, manufacturing method for lens device, and imaging apparatus - Google Patents

Abstract

To provide a lens device advantageous for obtaining high optical performance, for example.SOLUTION: A lens device (100a) includes an optical element (4), a lens barrel (1) housing the optical element (4), a receiving member (2) for receiving the optical element (4), a fixing member (3) for fixing the receiving member (2) to the lens barrel (1), and an adjustment mechanisms (5, 6) capable of adjusting a position of the receiving member (2) in an optical axis direction.SELECTED DRAWING: Figure 1

Description

The present invention relates to a lens device, a method for manufacturing a lens device, and an imaging device.

2. Description of the Related Art Conventionally, an adjustment mechanism is known that adjusts the position of an optical element in a lens apparatus in order to reduce the influence of variations in manufacturing of the optical element. Patent Literature 1 discloses a position adjustment mechanism that clamps an optical element between a pressing ring and an elastic member, and adjusts the position of the optical element in the optical axis direction by utilizing elastic deformation of the elastic member due to pressing of the pressing ring. It is In Patent Document 2, an optical element is sandwiched between a pressing ring and an elastic member, and after adjusting the position of the optical element in the optical axis direction using the pressing ring, an adhesive is injected into the side surface of the optical element to fix the optical element. A laser light source device is disclosed.

JP-A-10-96844 JP-A-1-255813

Since the optical element in Patent Literature 1 is still held by the elastic member after the position adjustment, the position may be displaced due to the impact. The optical element in Patent Document 2 requires an edge thickness for being firmly fixed with an adhesive after position adjustment.

An object of the present invention is, for example, to provide a lens device that is advantageous in obtaining high optical performance.

A lens device as one aspect of the present invention includes an optical element, a lens barrel for housing the optical element, a receiving member for receiving the optical element, a fixing member for fixing the receiving member to the housing frame, and an optical axis. an adjustment mechanism capable of adjusting the position of the receiving member in a direction.

Other objects and features of the invention are illustrated in the following examples.

According to the present invention, for example, it is possible to provide a lens device that is advantageous in obtaining high optical performance.

2 is a cross-sectional view of the lens device in Example 1. FIG. 2 is a cross-sectional view along line AA in FIG. 1; FIG. FIG. 11 is an exploded perspective view of the lens device in Example 2; FIG. 5 is a cross-sectional view of a lens device in Example 2; FIG. 11 is an exploded perspective view of a lens device in Example 3; FIG. 11 is a cross-sectional view of a lens device in Example 3; FIG. 7 is a cross-sectional view along line BB in FIG. 6; 4 is a flow chart of a method of manufacturing a lens device in each embodiment. 1 is a configuration diagram of an imaging device in each embodiment; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, a lens device 100a in Example 1 of the present invention will be described with reference to FIGS. 1 and 2. FIG. FIG. 1 is a cross-sectional view of a lens device 100a in the present embodiment taken along a plane passing through the optical axis. FIG. 2 is a cross-sectional view along line AA in FIG. The lens device 100 a has a storage frame (lens barrel) 1 , a barrel-mounted member 2 , a fixing member 3 , an optical element 4 , a pushing member 5 , a biasing member 6 and a plunger 7 .

The barrel member 2 is a receiving member that receives the optical element 4 . The barrel member 2 and the optical element 4 are housed in the housing frame 1 . Further, the body member 2 and the optical element 4 are substantially fitted inside the storage frame 1 with the same diameter. That is, the inner diameter of the housing frame 1 and the outer diameter of each of the optical element 4 and the body member 2 are equal to each other, and the optical element 4 and the body member 2 are fitted in the housing frame 1 .

A pushing member (holding member) 5 is screwed into the storage frame 1, and pushes the optical element 4 in the direction toward the barrel member 2 (to an arbitrary position in the optical axis direction). That is, the pressing member 5 is arranged on the opposite side of the optical element 4 from the waist member 2 in the optical axis direction, and presses the optical element 4 .

The storage frame 1 is provided with a receiving portion 101 with a body, and the biasing member 6 is adhered thereto. The waist member 2 is urged in the direction toward the optical element 4 by the urging member 6 . The biasing member 6 is preferably made of an elastic member such as rubber or a spring, or a magnetic member such as a magnet. The pushing member 5 and the biasing member 6 constitute an adjustment mechanism (moving means for moving the position of the waist member 2 in the optical axis direction) capable of adjusting the position of the waist member 2 in the optical axis direction.

The fixing member 3 is screwed to the barrel member 2 and can be tightened to fix the barrel member 2 to the storage frame 1 . Although the fixing member 3 is a screw in this embodiment, it is not limited to this, and may be another fixing member such as an adhesive. The plunger 7 is screwed into the storage frame 1 and is a pressing member that presses the waist member 2 against the storage frame 1 in a direction intersecting the optical axis.

When adjusting the position of the optical element 4 in the optical axis direction, the fixing member 3 is loosened, and the barrel member 2 and the optical element 4 are clamped by the biasing member 6 and the pushing member 5 . By rotating the pressing member 5 to move it in the optical axis direction, the body-mounted member 2 and the optical element 4 are also moved in the optical axis direction accordingly. A long hole (not shown) is formed in the storage frame 1 in the optical axis direction, and the fixing member 3 moves in the optical axis direction along with the waist member 2 during adjustment. It is conceivable that the biasing force applied to the body member 2 is not uniform due to variations in the shape of the biasing member 6, and that the body member 2 falls during adjustment, making smooth movement in the optical axis direction impossible. However, since the plunger 7 presses the barrel member 2 against the storage frame 1, the collapse is suppressed and the mobility in the optical axis direction is not impaired. In addition, by tightening the fixed member 3 after adjustment, an eccentric deviation of the optical axis occurs from the time of adjustment by the amount of backlash between the storage frame 1 and the member 2 with the body. If there is, it will be canceled.

In the present embodiment, the fixing member 3 is a screw that is screwed into the member 2 with a waist, but the fixing member 3 is not limited to this. For example, a set screw is screwed into the housing frame 1 to press and fix the body member 2 against the housing frame 1, or a hole is provided in the housing frame 1 and an adhesive is injected to fix the body member 2. may After the adjustment, it is possible to fix the barrel member 2 by tightening the fixing member 3 and fix the optical element 4 by tightening the pushing member 5 with an arbitrary torque. By providing a means for fixing the body member 2, the edge thickness of the optical element 4 is not limited, and the body member 2 always receives the urging force of the urging member 6 after adjustment. To prevent a waist member from being displaced by an impact and to maintain reliability.

Next, a lens device 100b in Example 2 of the present invention will be described with reference to FIGS. 3 and 4. FIG. FIG. 3 is an exploded perspective view of the lens device 100b in this embodiment. FIG. 4 is a cross-sectional view of a plane passing through the optical axis of the lens device 100b. The lens device 100 b has a storage frame (lens barrel) 1 , a barrel-mounted member 2 , a fixing member 3 , an optical element 4 , a pushing member 5 , an eccentric pin 8 , an adhesive member 9 , and a pressing plate 10 .

A bonding groove 202 is formed in the body member 2 , and the optical element 4 is bonded to the body member 2 by providing the bonding member 9 in the bonding groove 202 . The bonding member 9 is not limited to bonding as long as the optical element 4 can be attached (fixed) to the waist member 2 . In this embodiment, the optical element 4 and the body member 2 are separate members, but the present invention is not limited to this, and the optical element 4 and the body member 2 may be integrated.

The eccentric pin 8 is held by being rotatably fitted to the storage frame 1 (held by the storage frame 1 and penetrating the storage frame 1), and a pin portion 801 is formed on the member 2 with the body. It engages with the long groove 201 . The eccentric pin 8 and the long groove 201 constitute an adjustment mechanism (moving means for moving the position of the body member 2 in the optical axis direction) capable of adjusting the position of the body member 2 in the optical axis direction.

The center of the pin portion 801 is eccentric with respect to the rotation center of the eccentric pin 8, and by rotating the eccentric pin 8, the member with a body 2 moves in the optical axis direction by the amount of eccentricity. At the time of adjustment in the direction of the optical axis, the fixing member 3 is loosened as in the first embodiment, and by turning the eccentric pin 8, the member 2 along with the optical element 4 moves in the direction of the optical axis. After the adjustment, the fixing member 3 is tightened to fix the barrel member 2, and the pushing member 5 is tightened with an arbitrary torque to fix the optical element 4. FIG. The pressing plate 10 serves to prevent the eccentric pin 8 from coming off. As in Example 1, the fixing member 3 is a set screw or an adhesive.

In Example 1, since the adjustment is performed by rotating the pushing member 5, it is necessary to access from the optical axis direction. In this case, when adjusting the lens device 100a assembled in the apparatus, it is not easy to avoid interference with other parts, and for example, it is difficult to adjust while confirming the image formed through the lens device 100a. On the other hand, according to the lens device 100b of the present embodiment, by using the eccentric pin 8 for adjustment, it is possible to access and adjust from the side of the storage frame (lens barrel) 1, so the degree of freedom in assembly is high.

Next, a lens device 100c according to Example 3 of the present invention will be described with reference to FIGS. 5 to 7. FIG. FIG. 5 is an exploded perspective view of the lens device 100c in this embodiment. FIG. 6 is a cross-sectional view along a plane passing through the optical axis of the lens device 100c. FIG. 7 is a cross-sectional view along line BB in FIG. The lens device 100c includes a storage frame (lens barrel) 1, a first barrel-attached member 2a, a second barrel-attached member 2b, a third barrel-attached member 2c, a first fixing member 3a, a second fixing member 3b, and a third fixing member. 3c, an optical element 4 and an indentation member 5. FIG. Further, the lens device 100c includes a first eccentric pin 8a, a second eccentric pin 8b, a third eccentric pin 8c, a first adhesive member 9a, a second adhesive member 9b, a third adhesive member 9c, a first pressing plate 10a, a second It has a pressing plate 10b and a third pressing plate 10c.

An adhesive groove 202a is provided in the first member 2a with a sleeve, and the first adhesive member 9a is provided in the adhesive groove 202a to bond the optical element 4 and the first member 2a with the sleeve. The second body member 2b and the third body member 2c also have the same configuration and are adhered to the optical element 4. As shown in FIG. The first eccentric pin 8a is rotatably fitted to the storage frame 1, and the pin portion 801a is engaged with the long groove 201a provided in the first barrel member 2a. The tip of the pin portion 801a is spherical and makes point contact with the long groove 201a. The second eccentric pin 8b and the third eccentric pin 8c have similar structures and engage with the second and third shell members 2b and 2c, respectively.

The structures of the first eccentric pin 8a, the second eccentric pin 8b, and the third eccentric pin 8c are the same as the eccentric pin 8 of the second embodiment. The attached member moves in the optical axis direction. In this embodiment, by providing a plurality of mounting members, not only adjustment movement of the optical element in the optical axis direction but also tilt adjustment is possible.

When adjusting, the first fixing member 3a, the second fixing member 3b, and the third fixing member 3c are in a loosened state, the first eccentric pin 8a, the second eccentric pin 8b, and the third eccentric pin. 8c are rotated respectively. At this time, the first sleeve member 2a, the second sleeve member 2b, and the third sleeve member 2c move in the optical axis direction in conjunction with the eccentric pin, but the amount of rotation of the eccentric pin should be the same. , each of the three barrel members moves the same amount in the direction of the optical axis. As a result, it is possible to adjust the movement of the optical element 4 in the optical axis direction accordingly.

On the other hand, the inclination of the optical element 4 is generated by setting the rotation amounts of the first eccentric pin 8a, the second eccentric pin 8b, and the third eccentric pin 8c separately. For example, by changing the amount of rotation of the first eccentric pin 8a with respect to the second eccentric pin 8b and the third eccentric pin 8c, in FIG. The optical element 4 is tilted along with the body member around the axis la connecting the . The tip of the eccentric pin is spherical and makes point contact with each long groove, thereby preventing interference between the eccentric pin and the member with a barrel. In addition, the amount of tilt adjustment is limited to the range of fitting play between the optical element 4 and the storage frame 1 .

As described above, in this embodiment, a plurality of members with a waist (receiving members) are provided (having a plurality of movable members (a first member with a sleeve 2a, a second member with a sleeve, and a third member with a sleeve 2c)), The plurality of movable members are independently (separately) movable with respect to the storage frame 1 in the optical axis direction. In the present embodiment, the configuration in which the waist member is divided into the first member 2a, the second member 2b, and the third member 2c has been described, but it is not limited to this. Instead, it may be divided into two torso members or divided into four or more torso members.

Next, a method of manufacturing the lens devices 100a to 100c in each embodiment will be described with reference to FIG. FIG. 8 is a flow chart of a method for manufacturing the lens devices 100a-100c. First, in step S<b>101 , the waist member 2 and the optical element 4 are stored in the storage frame 1 . Subsequently, in step S102, the adjustment mechanism (the pushing member 5, the biasing member 6; the eccentric pin 8, the long groove 201) is used to adjust the position of the barrel member 2 in the optical axis direction. Subsequently, in step S<b>103 , the fixing member 3 is used to fix the waist member 2 to the storage frame 1 .

Next, referring to FIG. 9, an image pickup apparatus having lens devices 100a to 100c in each embodiment will be described. FIG. 9 is a configuration diagram of an imaging device (single-lens reflex camera) 900. As shown in FIG. In FIG. 9, a lens device (interchangeable lens) 100 corresponds to one of the lens devices 100a to 100c in each embodiment, and has an imaging optical system (lens unit) 901. FIG. A camera body 920 includes a quick return mirror 903, a focusing screen 904, a penta roof prism 905, an eyepiece lens 906, and the like. A quick return mirror 903 reflects upward the light beam formed via the imaging optical system 901 . A focusing screen 904 is arranged at an image forming position of the imaging optical system 901 . A penta roof prism 905 converts the reverse image formed on the focusing screen 904 into an erect image. The user can observe the erected image through the eyepiece 906 .

An imaging device 907 includes a CCD sensor or a CMOS sensor, and photoelectrically converts an optical image (object image) formed via the imaging optical system 901 (captures an image formed by a lens device). At the time of photographing, the quick return mirror 903 is retracted from the optical path and an optical image is formed on the image sensor 907 via the imaging optical system 901 . The control unit 910 has a CPU and controls the operation of each unit of the imaging device 900 .

Note that the imaging device 900 includes a camera body 920 having an imaging element 907 and a lens device 100 detachably attached to the camera body 920, but is not limited to this. An imaging device in which a camera body and a lens device are integrated may be used. In addition, the lens device of each embodiment can also be applied to a mirrorless single-lens reflex camera (mirrorless camera) without a quick return mirror, or other imaging devices such as broadcast cameras.

According to each embodiment, for example, it is possible to provide a small-sized lens device and an imaging device capable of adjusting the lens position in the optical axis direction, which is advantageous for obtaining high optical performance.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist.

1 Storage frame (lens barrel)
2 Body member (receiving member)
3 fixing member 4 optical element 5 pushing member (adjustment mechanism)
6 biasing member (adjustment mechanism)
8 eccentric pin (adjustment mechanism)
100a, 100b, 100c lens device 201 long groove (adjustment mechanism)

Claims (10)

an optical element;
a lens barrel that houses the optical element;
a receiving member that receives the optical element;
a fixing member that fixes the receiving member to the lens barrel;
and an adjusting mechanism capable of adjusting the position of the receiving member in the optical axis direction. 2. The lens device according to claim 1, wherein said optical element and said receiving member are fitted in said lens barrel. The adjustment mechanism is
a biasing member that biases the receiving member in a direction toward the optical element;
3. The lens device according to claim 1, further comprising a pressing member arranged on the side opposite to the receiving member with respect to the optical element in the optical axis direction and pressing the optical element. The adjustment mechanism is
an eccentric pin held in the lens barrel and passing through the lens barrel;
3. The lens device according to claim 1, further comprising a long groove formed in said receiving member and into which said eccentric pin is fitted. 5. The lens device according to claim 4, further comprising an adhesive member that adheres the optical element to the receiving member. 5. The lens device according to claim 4, wherein the optical element and the receiving member are integrated. 7. The lens device according to claim 1, wherein the lens barrel has a pressing member that presses the receiving member against the lens barrel in a direction intersecting the optical axis. having a plurality of the receiving members,
8. The lens device according to claim 1, wherein the plurality of receiving members are separately movable in the optical axis direction. housing the receiving member and the optical element in the lens barrel;
adjusting the positions of the receiving member and the optical element in the optical axis direction while the receiving member and the optical element are in contact with each other;
and fixing the receiving member to the lens barrel with a fixing member. a lens device according to any one of claims 1 to 8;
and an imaging device for capturing an image formed by the lens device.

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