JPH0738890Y2 - Projection lens - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a projection lens used in various microscopes such as a projector, a tool microscope, a measuring microscope, and a stereoscopic microscope, a camera, and other optical devices in more detail. The present invention relates to a projection lens having a mechanism for preventing the projection lens from falling during the attachment / detachment work.

[Background technology]

Various projection lenses are widely used as lenses for forming an image of an object to be measured or an object at a predetermined position. Among these types of projection lenses, the size and shape of the object to be measured are included. There is a device for inspecting and measuring, such as a projector to which this projection lens is detachably attached.

As a method of attaching and detaching the projection lens, for example, a projecting portion is provided on the outer periphery of the projection lens, and on the other hand, a hole portion for avoiding and engaging the projecting portion is provided on the projector side, and the projecting portion is provided in the hole portion. There is a so-called bayonet type in which the projection lens is held in the projector by rotating the projection lens in a predetermined direction after the insertion.

[Problems to be solved by the device]

In the bayonet type, since a small projector naturally uses a small and lightweight projection lens, there is no particular problem.

However, in a large projector, it is necessary to use a large and heavy projection lens, and therefore, the projection portion holding the projection lens needs to have strength enough to withstand the weight. In order to form such a protruding portion having high strength, it is preferable to use a metal such as brass or stainless steel because a light alloy such as aluminum may be insufficient in strength. Forming the portion causes a disadvantage that the manufacturing cost increases.

Therefore, what was developed for the purpose of reducing the manufacturing cost is a so-called screw type in which the projection lens and the projector are screwed and fixed.

In this screw type, the projection lens and the projector side are respectively threaded, and the projection lens is rotated to be screwed and fixed.

However, in this case, when attaching and detaching the projection lens, particularly when detaching the projection lens from the projector,
When the projection lens is rotated, it cannot be detected when the projection lens comes off. Therefore, the projection lens may be dropped carelessly, resulting in damage to the projection lens and the object to be measured.

In addition, the problem regarding such a projection lens is not limited to the projector, and is also applicable to other optical devices such as a microscope.

An object of the present invention is to provide a projection lens that does not drop accidentally when attached and detached.

[Means for Solving the Problems]

In the projection lens according to the present invention, a hole is provided on the lower surface of a fixing member held on the side of a device to be attached such as a projector, while a lens holder for holding the lens is provided with positioning means for engaging with this hole. A pin is projectingly fixed to either one of the fixing member or the lens holding body, and an engaging groove having a substantially J shape or the like with which the pin engages is provided on the other side, and the fixing member and the lens holding body are further provided. One of the two is provided with a fastening ring for fastening the two.

[Operation] With such a configuration, the work of attaching and detaching the projection lens, in particular,
When the projection lens is detached, even if the tightening ring is rotated to be separated from the fixing member, the pin contacts the engaging groove, so that the projection lens is held by the fixing member. At this point, it is possible to prevent a lens drop accident or the like. As a result, it can be easily removed by rotating the lens holder by a predetermined angle.
It is possible to improve safety.

〔Example〕

Next, a preferred embodiment of a projector as an attached device equipped with a projection lens according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates a projector as an attached device that employs a projection lens according to the present embodiment (which will be described later). The projector 10 includes a housing 11 having an inclined surface 11A and the housing 11. An image display unit that is placed on top and projects images in an enlarged manner
In addition, a general transmissive illuminating means (not shown) is provided in the housing 11, and a general reflective illuminating means (not shown) is also installed in the image display section 40.

On the inclined surface 11A, a power switch 12, a light source switch 13 for transmission, a light amount switch 14 and a light source switch for reflection.
15 are provided. Further, a position adjusting means 30 for moving an object to be measured, which will be described later, to a desired place is provided at substantially the center of the inclined surface 11A.
The handle 31 mounted on the side surface of the housing 11 is rotated in the direction of arrow A to move up and down.

The position adjusting means 30 includes a substrate 32, and first and second displacement mechanisms 33, 34 are arranged on the substrate 32. A handle 35 is attached to the first displacement mechanism 33,
By rotating this handle 35 in the direction of arrow A,
The second displacement mechanism 34 is configured to move in the arrow X direction.

Further, a handle 36 is attached to the second displacement mechanism 34, and by rotating the handle 36 in the direction of arrow B, the stage 37 attached to the second displacement mechanism 34 is indicated by the arrow. It is configured to move in the Y direction. A glass plate 38 is fixed to substantially the center of the stage 37, and a measured object W having a triangular shape, for example, is placed on the glass plate 38.

On the other hand, on the front panel 41 of the image display unit 40, a screen made of frosted glass or the like has a light-shielding plate 42 attached to the upper part thereof to block external light, and reference lines 43A and 43B made of straight lines orthogonal to each other. 44 and the outer periphery of the screen 44, and the screen 44 is fixed and held.
And a frame 45 made of metal, which is rotatable together with the front panel 41, and a rotary knob 46 for rotating the frame 45 and the screen 44 in the arrow B direction.
Then, a clamp lever 47 for fixing the frame body 45 to the front panel 41 at a desired position is mounted.

On the back side of the front panel 41 and near the clamp lever 47, an angle detecting means 49 for optically detecting the rotation angle of the screen 44 with respect to the front panel 41 is provided.

Further, a substantially trapezoidal mounting member 50 as a mounted portion is fixed to the lower part of the image display unit 40, and a front panel 51 thereof has an X-axis indicating the X-axis coordinate of the object platform 37 described above. Axis display section 52, Y-axis display section 53 showing Y-axis coordinates, and reset buttons 54, 55 for setting the coordinate values of these to zero.
And the screen 44 detected by the angle detection means 49.
Is provided with an angle display unit 56 that indicates the rotation amount, that is, the angle of the object to be measured W, and a reset button 57 that sets the value displayed on the angle display unit 56 to zero. Further, the projection lens 60 according to the present embodiment is detachably attached to the lower portion of the attachment member 50.

As shown in detail in FIGS. 2 to 5, the projection lens 60 includes a fixing member, such as a flanged cylindrical body 62, which is attached to the mounting member 50 side through four screws 61. And a lens holder 71 supported by the cylindrical body 62.

A male screw 64 is threaded on the outer peripheral surface 62A of the cylindrical body 62, and two substantially hemispherical holes 65, which are recessed in the axial direction, are formed on the bottom surface 62B at two positions facing each other by 180 degrees. Further, two pins 66 projecting inward in the radial direction are screwed and fixed to the position on the inner side surface 62C immediately above the hole portion 65. Then, the flange portion 67 at the upper end of the cylindrical body 62
Is provided with four stepped hole portions 68 at 90 ° equidistant positions, and the screws 61 are fitted into these stepped hole portions 68. Further, on the outer periphery of the flange portion 67, If necessary, knurling is applied to prevent slippage.

On the other hand, the lens holding body 71 includes a main body 72 and a tightening ring 73 supported by the main body 72. The main body 72 includes a first cylindrical body 74, and a central portion of the outer periphery of the first cylindrical body 74. Is fixed to the second cylindrical body 76 via a plurality of setscrews 75, and further the first cylindrical body is
At the lower end of 74, a third set screw 77
The cylinder 78 is attached. Then, in the lens holding body 71 composed of the first, second and third cylindrical bodies 74, 76 and 78,
The lenses 81A to 81G are fixed.

The second cylindrical body 76 is configured to include a first cylindrical portion 76A on the upper end side, a second circumferential portion 76B having a large diameter in the middle portion, and a third circumferential portion 76C on the lower end side. The one circumferential portion 76A is provided with two substantially flat J-shaped engagement grooves 82, and these engagement grooves 82 are provided.
Are provided at positions respectively corresponding to the two pins 66 of the cylindrical body 62.

The engagement groove 82, as clearly shown in FIG.
A, a horizontal portion 82B that is defined from the vertical portion 82A to a position that moves by a predetermined angle θ (preferably approximately 30 degrees) along the circumferential direction of the first circumferential portion 76A, and from the horizontal portion 82B It is formed with a top portion 82C which is directed upward and extends in a substantially hemispherical shape.

Further, a positioning means 85 that engages with the hole portion 65 of the cylindrical body 62 is provided above the second circumferential portion 76B. As shown in FIG. 5, the positioning means 85 includes a hole portion 86 formed in the second circumferential portion 76B, and a rod 87 is fitted and inserted in the hole portion 86. A screw 88 is screwed on the
Further, the rod 87 is provided with a pressing coil spring 89 that is locked between the screw 88 and the second circumferential portion 76B, so that the rod 87 is always in the arrow Z ₁ direction (vertical downward direction). )
Be urged by.

Therefore, when the tightening ring 73 is lowered in the direction of arrow Z ₁ ,
The rod 87 is located at the position shown by the chain double-dashed line in FIG. 5, while the tightening ring 73 is pulled up in the direction of the arrow Z ₂ and the rod 87 is screwed by the stepped portion of the tightening ring 73, which will be described later. When 87 is pushed up against the coil spring 89, the tip of the rod 87 is projected from the upper surface of the second circumferential portion 76B.

A fastening ring 73 that is displaced by a predetermined distance D in the arrow Z direction is attached to the outer circumferences of the second and third circumferential portions 76B and 76C, and the predetermined distance D is the third circumferential portion. It is regulated by a male screw 91 formed on the outer periphery of 76C and a female screw 92 formed on the lower end inner peripheral surface 73A of the tightening ring 73 and screwed over the male screw 91. Further, on the upper end inner peripheral surface 73B of the tightening ring 73,
A female screw 93 that can be screwed into the male screw 64 of the cylindrical body 62 is provided, and a rubber band 94 that prevents slippage during rotation operation is attached to the outer peripheral surface 73C. Therefore, by screwing the female screw 93 of the tightening ring 73 into the male screw 64 of the cylindrical body 62, the lens holder 71 is firmly fixed to the cylindrical body 62.

The projector 10 that employs the projection lens 60 according to the present embodiment is basically configured as described above. Next, regarding its operation, refer to FIGS. 6 (A) to 6 (C). It will be described with reference to FIG.

First, the case where the lens holder 71 is attached to the cylindrical body 62 will be described.

That is, by sandwiching the lens holder 71 with a finger or the like, as shown in FIG. 6 (A), each pin 66 of the cylindrical body 62 is aligned with the vertical portion 82A of the engaging groove 82, and then Z ₂ Move in the direction and insert each.

After that, when the lens holder 71 is rotated by approximately 30 degrees in the direction of the arrow R ₁ , the pin 66 slides on the horizontal portion 82B as shown in FIG. Abut on the side wall of 82C.

Then, while tightening ring 73 is raised in the direction of arrow Z ₂ ,
When rotated in the R ₁ direction and the female screw 93 of the tightening ring 73 is screwed and fixed to the male screw 64 of the cylindrical body 62, the step 73D of the upper end inner peripheral surface 73B of the tightening ring 73 contacts the screw 88 of the positioning means 85. Touching rod 87
Is moved in the direction of arrow Z ₂ against the pressing force of the coil spring 89. As a result, the tip of the rod 87 protrudes and engages with the hole 65, so that the cylindrical body 62 and the lens holding body 71 are positioned.

Then, when the illumination light L is output from the transmission illumination means (not shown), the illumination light L passes through the position of the object to be measured W, enters the projection lens 60, and then is repeatedly reflected several times in the image display unit 40. Then reach screen 44. At this time, the first
As can be easily understood from the figure, a magnified image of the object to be measured W is drawn on the screen 44.

At this time, if the details of the object to be measured W are difficult to visually recognize with the projection lens 60 currently attached, it must be replaced with a projection lens (not shown) of another magnification. For that purpose, first, it is necessary to remove the projection lens 60.

That is, the projection lens 60 is removed by rotating the tightening ring 73 in the direction of arrow R ₂ as shown in FIG. 6 (C). Along with this rotation, as the tightening ring 73 and thus the stepped portion 73D moves in the arrow Z ₁ direction, the rod 87 is gradually displaced in the arrow Z ₁ direction by the action of the coil spring 89. Then, when the tightening ring 73 separates from the cylindrical body 62, the rod 87 is completely separated from the hole 65 by the pressing force of the coil spring 89.

With the separation of the tightening ring 73 from the cylindrical body 62, the main body 72 of the lens holding body 71 tends to separate from the cylindrical body 62 together with the tightening ring 73. However, at this time, the pin 66 of the cylindrical body 62 is engaged with the engaging groove 82.
Since it is in contact with the top portion 82C of the lens holder 71, the lens holder 71 cannot be removed in this state.

Therefore, from the state shown in FIG.
After slightly displacing in the Z ₂ direction (vertically upward direction) to displace the pin 66 to the horizontal portion 82B of the engaging groove 82, rotate the lens holder 71 in the direction of arrow R ₂ by about 30 degrees to move the pin 66. After moving to the vertical part 82A and then moving in the Z ₁ direction, FIG. 6 (A)
The lens holding body 71 can be detached from the cylindrical body 62 in a state similar to the above.

Then, if a desired projection lens (not shown) is attached in the same manner as described above, an image with a desired magnification can be obtained. Therefore, the size and shape of the object to be measured W should be inspected and measured. You can

According to this embodiment as described above, there are the following effects.

That is, in this embodiment, the cylindrical body 62 is provided with the hole portion 65 and the pin 66, and the lens holding body 71 is provided with the substantially J-shaped engaging groove 82 and the positioning means 85. Therefore, when the lens holder 71 is fixed to the cylindrical body 62, the rod 86 of the positioning means 85 is engaged with the hole portion 65, so that the lens holder 71 does not move carelessly.

In addition, when attaching and detaching the lens holding body 71, especially when removing it,
Even if the tightening ring 73 is separated from the cylindrical body 62, the pin 66 is engaged with the engaging groove.
Since it abuts the top 82C of 82, this allows the projection lens 6
The lens holder 7 does not drop 0 accidentally.
It is possible to prevent 1 or the object to be measured W from an accident such as damage, and as a result, it is possible to improve safety.

Further, the rod 87 of the positioning means 85 is a coil spring.
By the action of 89, the second circumferential portion 76B of the second cylindrical body 76 is always present.
Since it is immersed from the upper end of the projection lens 60, it is possible to prevent the projection lens 60 from being accidentally tilted due to the user's clothes or the like being caught on the rod 87 of the projection lens 60 in the removed state.

Next, referring to FIG. 7, another embodiment of the positioning means will be described.

This positioning means is slightly different in configuration from the positioning means 85 of the above-mentioned embodiment, and since the other parts are the same as those of the above-mentioned embodiment, the same components are designated by the same reference numerals and detailed description thereof will be given. The description is omitted.

That is, in FIG. 7, the positioning means 95 includes a hole portion 96 bored in the second circumferential portion 76B of the second cylindrical body 76, and a substantially T-shaped rod 97 is twisted in the hole portion 96. The rod 97 is supported on the second circumferential portion 76B side via a coil spring 98, and the rod 97 is swingable in the arrow S direction by a torsion coil spring 98.

Then, when the tightening ring 73 is screwed into the cylindrical body 62, the rod
Since 97 is pushed in the direction of arrow S ₁ by the stepped portion 76D of the tightening ring 73, the arrow 97 resists the urging force of the torsion coil spring 98.
It is displaced in the S ₁ direction and engages with the hole 65.

In this case, the positioning means 95 does not have the screw 88 fixed to the rod 87 by screwing, unlike the positioning means 85 of the above-described embodiment, so that the effect can be provided at a low cost.

The present invention has been described above with reference to the preferred embodiments, but the present invention is not limited to these embodiments, and various improvements and design changes can be made without departing from the gist of the present invention. Of course.

For example, the male screw 64 can be threaded on the lens holding body 71 side, and the tightening ring 73 can be provided on the cylindrical body 62 side. In any case, the cylindrical body 62 as the fixing member and the lens holding body 71 are tightened. It suffices if it can be fastened with the ring 73.

It is also possible to provide the pin 66 on the lens holding body 71 side and define the engagement groove 82 on the cylindrical body 62 side. Further, the predetermined angle θ is not limited to 30 degrees and can be appropriately selected any number of times, but if θ is set too large, the rotation amount increases when the lens holding body 71 is removed, so θ is 30. A degree is suitable.

Further, the positioning means 85, 95 need not be directly under the engaging groove 82, and in short, the main body 72 such as on the second circumferential portion 76B.
It may be any as long as it is provided below the engaging groove 82 in.

Further, the main body 72 is not limited to one in which the first, second, and third cylindrical bodies 74, 76, and 78 are separately configured, and may be integrally provided, and the number of lenses 81A to 81G may be increased as necessary. You can increase or decrease.

Further, the projection lens 60 is not limited to the one applied to the projector 10, and it goes without saying that it can be adopted in other optical devices such as various microscopes and cameras.

[Effect of device]

As described above, according to the projection lens of the present invention, there is an effect that it is not accidentally dropped when attaching and detaching.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG. 6 show an embodiment in which the present invention is applied to a projector, and FIG. 1 is a perspective view showing the entire structure, and FIG.
FIG. 4 is an exploded perspective view of the projection lens, FIG. 3 is a half sectional side view of the projection lens, and FIG. 4 is an enlarged sectional view of a main part of the projection lens.
FIG. 5 is an enlarged cross-sectional view of the main part of FIG. 4, FIG.
FIG. 7C is an operation explanatory view, and FIG. 7 is a sectional view showing another embodiment of the positioning means in the present invention. 10: Projector as attached device, 50: Mounting member, 60
...... Projection lens, 62 …… Cylinder body as fixed member, 65 ・ ・ ・
... Hole, 66 ... Pin, 71 ... Lens holder, 72 ... Main body, 73 ... Tightening ring, 81A-81G ... Lens, 82 ... Engaging groove, 85 ... Positioning means, 87 ... … Rod, 89… Coil spring, 95… Positioning means, 97… Rod, 98…
… Torsion coil spring, W… Object to be measured.

Claims (4)

[Scope of utility model registration request] 1. A projection lens comprising: a fixing member supported by a mounting member provided on a device to be mounted; and a lens holder detachably attached to the fixing member, wherein the fixing member comprises: In addition to having a hole provided on the bottom surface of the fixing member, the lens holding body has a positioning means that can advance and retreat with respect to the hole, and either the fixing member or the lens holding body is substantially In addition to a pin protruding inward in the radial direction, the other one is provided with an engagement groove in which the pin is slidable and which can lock the lens holding body via the pin, and the lens holding body or A projection lens, comprising a tightening ring that is supported by one of the fixing members and that fastens the fixing member and the lens holding body. 2. The projection lens according to claim 1, wherein the engagement groove is formed in a substantially flat J shape. 3. The projection lens according to claim 1 or 2, wherein the positioning means biases the rod by a coil spring. 4. The projection lens according to claim 1 or 2, wherein the positioning means biases the rod by a torsion coil spring.