JPH0525411U - Lens mount - Google Patents

Abstract

(57) [Abstract] [Purpose] The lens frame can be attached and detached with the same ease as with a bayonet type lens mount, the number of parts is small, and the lens frame is attached with a structure that can be fastened to the screw mount base. Providing a lens mount that securely fixes even a large-diameter heavy lens. [Structure] The mount side comprises a mount base, a screw frame body fitted and fixed to the mount base body, and a coupling frame body screwed to the mount base body. When the lens frame is inserted into the mount base body and rotated in one direction, the lens frame engages. A lens mount in which a projection rotates a coupling frame body, and the coupling frame body is screwed to pull a lens frame into a mount base body through an engaging protrusion to press-contact the mount base body and fix it.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lens mount for attaching a lens frame to an optical device such as an interferometer, a microscope, and a camera, and particularly a large lens having a large diameter such as a lens diameter of 100 to 150 mm and a weight of 1 to 4 kg. The present invention relates to a lens mount that is preferably used to attach a held lens frame.

[0002]

[Prior Art]

 The large-diameter heavy lens described above is often used in interferometers, etc., but it is easy to attach and detach the lens frame holding such a lens to the optical device. Mounts were used.

In a bayonet type lens mount, the lens frame is pulled toward the mount base side by an elastic component such as a spring plate provided on the mount base on the optical device side, and the bayonet claw component provided on the lens frame is pressed against the mount base. Alternatively, the structure is such that the abutting portion of the lens frame is brought into pressure contact with the mount base, and the lens frame is not fastened to the mount base with screws. Therefore, when the lens is a large-diameter heavy lens, the weight of the lens reduces the spring pressure that presses the lens frame against the mount base, which causes a problem that the lens frame easily moves with respect to the mount base. If the lens frame is mounted from below, the total weight of the lens frame will counteract the above-mentioned spring pressure, and the above problem will be exacerbated.

In the interferometer, in particular, it is required that the lens is fixed securely and fine movement of several tens of nm is not allowed. Therefore, when attaching a heavy lens with a bayonet-type lens mount, the lens frame and the mount base are further coupled with a screw. However, if this is done, the bayonet-type lens mount that loses the ease of attaching and detaching the bayonet-type lens by connecting with screws is meaningless to use the bayonet-type lens mount, which requires high processing accuracy and a large number of parts.

[0005]

[Problems to be solved by the device]

 The present invention allows the lens frame to be attached / detached with the same ease as with a bayonet type lens mount, requires a small number of parts, and is mounted with a structure in which the lens frame is fastened to the mount base with a screw, and has a large diameter. The objective is to provide a lens mount that securely fixes even a heavy lens.

[0006]

[Means for Solving the Problems]

 According to the present invention, the outer peripheral shape of the lens frame has a fitting diameter portion, a step end surface following the fitting diameter portion, and a large diameter portion continuing from the fitting diameter portion, and an engaging projection is provided on the fitting diameter portion. The mount side structure for mounting the lens frame is formed such that an inner diameter is formed in the fitting hole of the fitting diameter portion on the lens frame insertion side, and a passage groove for the engaging projection is formed in the fitting hole. A mounting base that has an inner flange whose outer front surface is the contact surface of the step end face, and a screw that is fitted and fixed to the mount base from the side opposite to the lens frame insertion side, and has a lead screw formed on the inner diameter. The frame and the lead screw of the screw frame are screwed into the mount base so as to be rotatable and mounted on the peripheral wall having an inner diameter into which the fitting diameter of the lens frame fits. And a rotating end engaging portion whose rotation range is restricted by engaging with Is formed on one end side of the mount base, an engagement groove is formed which includes an introduction groove portion of the engagement protrusion of the lens frame that occupies an extension position of the passage groove of the mount base body, and a dead end groove portion that bends and extends from the engagement protrusion portion. The lens mount is characterized by having a combined structure with a coupling frame body, and the above-mentioned object is achieved by this structure.

[0007]

[Action]

 In other words, the lens mount of the present invention requires a small number of parts, and the lens frame is fixed by inserting the lens frame into the fitting hole of the mount base from the fitting diameter side and engaging the lens frame. When the fitting protrusion passes through the passage groove and hits the inside of the introduction groove of the engagement groove of the coupling frame, turn it toward the dead end groove, and the engaging protrusion of the lens frame pushes the end of the dead end groove to rotate the joint frame. , The coupling frame is screwed to the side opposite to the lens frame insertion side by screwing with the screw frame, so that the step end surface of the lens frame is tightened to the inner flange contact surface of the mount base. The lens frame is removed by rotating the lens frame in the opposite direction and the rotation of the coupling frame is stopped by the engagement of the rotation end engaging part with the rotation range restricting part of the mount base. If so, the lens frame is pulled out to the insertion side.

Therefore, according to the lens mount of the present invention, the lens frame can be easily attached and detached, and the lens frame can be reliably fixed even if the lens has a large diameter and a heavy weight.

[0009]

【Example】

 Hereinafter, the present invention will be described with reference to illustrated examples.

FIG. 1 and FIG. 2 are a longitudinal sectional view and a one-quadrant partial plan view showing an example of a mount side structure of a lens mount of the present invention, and FIG. 3 is a perspective view showing an example of a lens frame.

In FIG. 3, reference numeral 1 denotes a lens frame for holding the lens L, the outer peripheral shape of which is provided on the fitting diameter portion 1a, the step end surface 1b following it, the large diameter portion 1c following it, and the fitting diameter portion 1a. It has an engaging projection 1d. Here, the engaging protrusion 1d is a round bar-shaped protrusion at two places, but the present invention is not limited to this, and the cross-sectional shape other than a circle may be used at three or more places. The large-diameter portion 1c is not limited to the example shown in the figure, and may be any one that forms a step end surface 1b that abuts the surface of the mount base between the large-diameter portion 1c and the fitting diameter portion 1a.

In FIGS. 1 and 2, reference numeral 2 denotes a mount base fixed to a device frame such as an interferometer by a suitable known means such as tightening the outer periphery. The mount base has an inner diameter on the insertion side of the lens frame 1. It has an inner flange portion 2a which becomes a fitting hole for fitting the fitting diameter portion 1a of the frame 1 and a front surface around the fitting hole serves as an abutting surface for abutting the step end surface 1b of the lens frame 1, The hole is formed with a passage groove 2b for allowing the engagement protrusion 1d of the lens frame 1 to pass therethrough.

A screw frame 3 is fitted to the mount base 2 from the side opposite to the insertion side of the lens frame 1 and the outer flange portion 3 a is fixed by being screwed to the outer flange portion 2 c of the mount base 2. It is a body and has a screw 3b formed on its inner diameter. This screw frame body 3 has a screw through groove 3c at a position where the outer peripheral direction of the outer flange portion 3a is divided into 16 equal parts, and the screw 4 is passed through the two screw through grooves 3c at the 180 ° position of the screw through groove 3c. The flange portion 3a is fastened to the outer flange portion 2c of the mount base 2, and the screw through groove 3c through which the screw 4 passes can be appropriately selected to change the fixed phase to the mount base 2. However, the method of fixing the screw frame body 3 to the mount base body 2 is not limited to this.

Reference numeral 5 denotes a screw 5b formed on the outer periphery of the screw frame body 3 that is fitted into the mount base body 2 when the screw frame body 3 is fitted and fixed to the mount base body 2 in a state of being screwed with the inner diameter screw 3b of the screw frame body 3. Is a coupling frame body, and a rotation end whose rotation range is restricted by engaging with a rotation range restriction part 2d of the mount base 2 on a peripheral wall having an inner diameter into which the fitting diameter part 1a of the lens frame 1 is inserted. The engaging portion 5a and the introduction groove portion 5d of the engaging protrusion 1d of the lens frame 1 which is aligned with the passage groove 2b of the inner flange portion 2a of the mount base 2 in a state of being rotated to one end side of the rotation range, And an engaging groove formed of a dead end groove portion 5c which bends in the movable direction and extends. The pivotal end engaging portion 5a of the coupling frame 5 is provided so as to project from the peripheral wall tip end surface, and engages with the pivotal range restricting portion 2d of the groove provided on the inner surface of the inner flange portion 2a of the mount base 2. The engaging groove is formed in the turning end engaging portion 5a, but the present invention is not limited to this. For example, the turning end engaging portion 5a is provided so as to project to the side surface of the peripheral wall tip portion, It engages with the rotation range restricting portion 2d of the groove provided on the inner surface of the base 2 which is deeper than the inner flange portion 2a, and the engagement groove is formed on the peripheral wall portion of the coupling frame body 5 where the rotation end engaging portion 5a is not provided. It may be formed. Further, the turning end engaging portion 5a may be a groove provided on the outer surface of the peripheral wall, and the turning range restricting portion 2d may be a protrusion provided on the inner surface deeper than the inner flange portion 2a. Needless to say, the number of the engaging grooves and the number of the passing grooves 2b of the mount base 2 are set to be the same as the number of the engaging protrusions 1d of the lens frame 1. The number of rotation range restricting portions 2d is not limited to that.

The mount side has an assembly structure of the mount base 2, the screw frame body 3 and the coupling frame body 5 as described above. When mounting the lens frame 1 on the mount side, the coupling frame body 5 has an engaging groove. The lens frame 1 is inserted from the fitting diameter portion 1a into the fitting hole of the mount base 2 in the state of being rotated to one end side of the rotation range matched with the position of the passage groove 2b of the mount base 2 as shown in FIG. The engaging protrusion 1d of the lens frame 1 is passed through the passage groove 2b of the mount base 2 and abutted against the inner side of the introduction groove portion 5d of the engaging groove of the coupling frame body 5. Next, the lens frame 1 is rotated in a direction in which the engaging protrusion 1d enters the dead end groove portion 5c of the engaging groove, and thereby the coupling frame body 5 is also rotated together. The rotation of the coupling frame body 5 causes the coupling frame body 5 to be screwed upward in FIG. 1 because the coupling frame body 5 is screwed with the screw frame body 3. As a result, the dead end groove portion 5c of the engaging groove pulls the lens frame 1 into the mount base body 2, and as a result, the step end surface 1b of the lens frame 1 is tightened on the front surface of the inner flange portion 2a of the mount base body 2 You can no longer turn 1. This completes the installation. This is achieved within the turning range until the turning end engaging portion 5a of the coupling frame body 5 comes into contact with the other end side of the turning range regulating portion 2d of the mount base 2. The screw frame 3 is provided with a large number of screw through grooves 3c in the circumferential direction in order to facilitate this adjustment.

The lens frame 1 is removed by rotating the lens frame 1 in the opposite direction so that the coupling frame body 5 contacts the end of the rotation range as shown in FIG. 1, and then pulling out the lens frame 1.

[0017]

[Effect of the device]

 Since the lens mount of the present invention has a small number of parts as described above, the lens frame can be easily attached and detached similarly to the bayonet type, and since the lens frame is tightened and fixed, even if the lens has a large diameter and a heavy weight. It has an excellent effect that the fixing is stable and reliable.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a mount side.

FIG. 2 is a partial quadrant plan view.

FIG. 3 is a perspective view of a lens frame.

[Explanation of symbols]

 1 Lens Frame 2 Mount Base 3 Screw Frame 5 Coupling Frame

Claims (1)

[Scope of utility model registration request] 1. An outer peripheral shape of a lens frame has a fitting diameter portion, a step end surface following the fitting diameter portion, and a large diameter portion continuing from the fitting diameter portion, and an engaging projection is provided on the fitting diameter portion. The mount side structure for mounting the lens frame is such that an inner diameter is formed in the fitting hole of the fitting diameter portion on the lens frame insertion side, and a passage groove of the engaging projection is formed in the fitting hole. A mount base having an inner flange portion whose outer front surface is an abutting surface of the step end face, and a screw frame fitted and fixed to the mount base from the side opposite to the lens frame insertion side and having a lead screw formed on the inner diameter. Body and a peripheral wall that is rotatably fitted in the mount base by screwing with the lead screw of the screw frame, and has a rotation range restricting part of the mount base on a peripheral wall having an inner diameter into which the fitting diameter part of the lens frame fits. The rotation end engaging portion that is engaged to regulate the rotation range and the rotation range that is regulated A coupling having an engagement groove formed of an introduction groove portion of the engagement protrusion of the lens frame that occupies an extension position of the passage groove of the mount base body in a state of being on one end side and a dead end groove portion that bends and extends in a rotatable direction from the introduction groove portion. A lens mount characterized by having a structure combined with a frame.