JP2011107459A - Lens holding member, lens unit, and projector device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens holding member that inserts a lens from a direction perpendicular to an optical axis direction and can easily and stably hold the lens. <P>SOLUTION: In the lens holding member 8, holding parts 10 regulating the position in the radial direction perpendicular to the optical axis direction and the position in the optical axis direction and holding a noncircular lens L3 are formed at three parts. Each holding part 10 has a storage recessed shape that has a squared U-shaped cross-section, and the edge part L3-1 of the noncircular lens L3 is inserted from the radius direction perpendicular to the optical axis direction. Each holding part 10 is elastically deformable, and, in the noncircular lens L3 of the edge part L3-1, both the lower ends are placed on a locking part projecting to the radius direction in the C part of Fig.1(a) so as to be locked. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lens holding member, particularly a lens holding member suitable for holding a non-circular lens (including the concept of a deformed lens, a cut lens, a D-cut lens, etc.), a lens unit having the lens holding member, and the lens The present invention relates to a projector apparatus having a holding member.

  In a lens using device represented by a camera or a projector, as a method of holding a lens, generally, a method of pressing a lens portion such as a lens edge portion that does not use a light beam with a screw or a pressing member (Patent Document 1, 2), a method of melting the outer peripheral portion of the lens holding member such as heat caulking, and restraining the lens (see Patent Document 3).

  By the way, lenses used in cameras and projectors are used exclusively in a circular shape, but recently, in order to improve the optical path efficiency and prevent vignetting of light rays, cut unused parts other than the effective parts in terms of optical characteristics to secure product space. However, there are an increasing number of cases where the degree of freedom in design is increased and the size of the apparatus is reduced.

  Since the cut lens is non-circular, it is not possible to use means such as heat caulking to melt the peripheral portion and press it uniformly from the peripheral portion, and it is suppressed by screwing or pressing members.

Japanese Utility Model Publication No. 04-061307 JP 2002-228910 A JP 04-166905 A

  However, in order to perform screwing, a certain thickness is required for the holding member, and it is necessary to secure a space for inserting the screw, resulting in disadvantages such as securing the space and adding the number of components.

  Moreover, when screwing, the holding member is required to have a certain thickness so that the holding member is not broken by tightening, and the size and weight must be increased.

  In the “method of pressing and fitting a lens from the lens optical axis direction and holding the lens outer peripheral end by a plurality of elastically deformable pressing members” disclosed in Patent Document 1, an operation of pushing the lens from the optical axis direction is performed. Since this is necessary, a space is required for assembly.

  If the lens is inserted and held from a direction orthogonal to the optical axis direction, the insertion member cannot be provided with the pressing member that protrudes in the optical axis direction. End up.

  The present invention has been made in view of such circumstances, and its main object is to provide a lens holding member that can be easily and stably held by inserting a lens from a direction orthogonal to the optical axis direction. .

  In order to achieve the above object, according to a first aspect of the present invention, in the lens holding member for holding the non-circular lens, the non-circular lens is moved in the radial direction perpendicular to the lens optical axis and the outer peripheral end portion is inserted. A holding portion that restricts a radial position orthogonal to the lens optical axis of the outer peripheral end portion and a position in the lens optical axis direction, and an outer peripheral end portion of the non-circular lens is inserted into the holding portion. And a locking portion that prevents the non-circular lens from falling off in the radial direction.

  According to a second aspect of the present invention, in the lens holding member according to the first aspect, the holding portion is elastically deformable, and the outer peripheral end of the non-circular lens is inserted into the holding portion. The part is held by an elastic force.

  According to a third aspect of the present invention, in the lens holding member according to the first or second aspect, the locking portion has a projection or a convex shape that locks the lower end of the non-circular lens. It is characterized by.

  According to a fourth aspect of the present invention, in the lens holding member according to the third aspect, the portion having the locking portion can be elastically deformed in the radial direction independently of other portions.

  According to a fifth aspect of the present invention, the lens unit includes the lens holding member according to any one of the first to fourth aspects.

  According to a sixth aspect of the present invention, in the projector device, the lens holding member according to any one of the first to fourth aspects is provided.

  According to the present invention, it is possible to easily and stably hold a non-circular lens in a small operation space.

It is a figure which shows the lens holding member which concerns on the 1st Embodiment of this invention, (a) is a schematic front view, (b) is a schematic sectional drawing in the AA line. It is an enlarged view of B site | part in FIG.1 (b). It is an enlarged view of C site | part in Fig.1 (a). It is a schematic sectional drawing which shows the optical path in a lens holding member. It is a general | schematic perspective view from a different angle of a projector apparatus. It is a figure which shows the lens holding member which concerns on 2nd Embodiment, (a) is a schematic front view, (b) is a schematic sectional drawing in the DD line. It is an enlarged view of E site | part in FIG.6 (b). It is an enlarged view of F site | part in FIG.6 (b).

  Embodiments of the present invention will be described below with reference to the drawings.

  First, a first embodiment will be described with reference to FIGS.

  FIG. 5 shows the main internal configuration of the projector apparatus 2 with the exterior panel removed. Reference numeral PN denotes a liquid crystal panel as image display means. In the liquid crystal panel PN, an image display surface is an “image display surface”.

  The liquid crystal panel PN is a transmission type, and is irradiated with an illumination light beam from a light source (not shown) arranged on the right side of the figure, and the intensity distribution of the transmitted light beam is intensity-modulated two-dimensionally by an image displayed on the image display surface. Is done.

  The projector device 2 is a so-called three-plate type color projector, and three liquid crystal panels PN are used. A light beam that is color-synthesized by a color synthesizing prism (not shown) provided in a portion surrounded by the liquid crystal panel and the PN, The light enters a fixed lens portion (not shown) disposed in the lens unit 4.

  The lens unit 4 has a movable lens portion 6 that can move in the direction of the optical axis AX on the light emission side.

  The light flux from the liquid crystal panel PN is incident on the fixed lens portion, passes through the fixed lens portion, passes through the movable lens portion 6 and tilts upward with respect to the optical axis AX as shown in FIG. The light is emitted from the movable lens unit 6 as an oblique light beam.

  The oblique light beam emitted from the movable lens unit 6 becomes an imaging light beam (light beam that forms an image of an image displayed on the image display surface of the liquid crystal panel PN), and is projected onto a screen (not shown) that is a projection surface. An “projected image obtained by enlarging the image displayed on the image display surface” is formed.

  The magnification of the projected image projected on the screen is changed by adjusting the object distance and the image distance. The object distance is changed by adjusting the distance between the fixed lens unit and the liquid crystal panel PN, and the image distance is the lens optical axis direction (hereinafter simply referred to as “optical axis direction”) distance between the movable lens unit 6 and the screen. Adjust and change.

  When the magnification of the projected image is changed as described above, the image plane falls down with respect to the screen or the shape of the projected image becomes trapezoidal. This needs to be corrected. Is performed by displacement in the optical axis direction.

  As shown in FIG. 1, the movable lens unit 6 includes a lens holding member 8 and lenses L1, L2, and L3 held by the lens holding member 8.

  These lenses L1, L2, and L3 are plastic lenses and are non-circular lenses.

  The lens holding member 8 is made of plastic, and has a cylindrical adjustment portion 8a that is screwed to a front end portion of the lens barrel of the lens unit 4 in the light beam emission direction, and a cylindrical first accommodation portion 8b that accommodates and holds the lens L1. A second housing portion 8c that houses and holds the lens L2 with a larger diameter than the first housing portion 8b, and a third housing portion 8d that houses and holds the lens L3 with a larger diameter than the second housing portion 8c. ing.

  A screw is formed on the outer peripheral surface of the adjusting portion 8a, and the movable lens portion 6 can be moved and adjusted with respect to the lens unit 4 body in the optical axis direction.

  The 2nd accommodating part 8c and the 3rd accommodating part 8d are the semi-cylindrical shape of only an upper half part from the optical axis AX.

  The non-circular lenses L1, L2, and L3 are designed to have a “circular shape with the optical axis AX as the central axis”, but as shown in FIG. 1, substantially half below the optical axis AX is cut off. . In other words, the shape of the optical axis symmetric lens is “a shape that includes the light beam cross section of the effective light beam that contributes to the formation of the projected image and is substantially the same shape as this light beam cross section”.

  The third holding portion 8d that holds the non-circular lens L3 moves the non-circular lens L3 from the radial direction orthogonal to the optical axis AX direction to three locations on the outer periphery thereof, and an edge portion L3-1 that is an outer peripheral end portion thereof. A holding portion 10 having a U-shaped cross section can be inserted.

  As shown in FIGS. 1B and 2, each holding unit 10 extends from the lens installation surface 12 in a radial direction perpendicular to the optical axis direction, extending substantially parallel to the optical axis direction from the lens installation surface 12. The first restricting portion 14 that restricts and the second restricting portion 16 that extends from the first restricting portion 14 toward the optical axis AX in the radial direction and restricts the position in the optical axis direction. That is, the holding part 10 in this embodiment is formed as an accommodation concave part having a U-shaped cross section. As shown in FIG. 4, the 1st control part 14 is opened.

  The second restricting portion 16 is elastically deformable, and the insertion opening of the holding portion 10 is arranged so that the second restricting portion 16 has an optical axis when the edge portion L3-1 of the non-circular lens L3 is inserted into the holding portion 10. The edge L3-1 is set so as to be held in pressure contact after being inserted and deformed.

  In order to smoothly insert the edge portion L3-1, the inner surface of the second restricting portion 16 is preferably a tapered surface.

  At both corners at the lower end of the lens installation surface 12 indicated by reference numeral B in FIG. 1A, as shown in FIG. 3, locking portions 18 projecting inward in the radial direction are formed. In the present embodiment, the locking portion 18 is formed as a trapezoidal convex portion.

  The non-circular lens L3 has its outer peripheral end inserted into the holding part 10, and then the lower end (strictly speaking, the lower end of the edge part L3-1) is placed on the engaging part 18 and is prevented from falling off in the radial direction. It is locked to.

  Accordingly, the non-circular lens L3 is stably accommodated and held in the third accommodating portion 8d in a state where the non-circular lens L3 is prevented from falling off.

  Since the lens can be moved and held from the direction orthogonal to the optical axis direction, it can be easily assembled even if the space in the optical axis direction is small as compared with the “push-in setting method from the optical axis direction” described in Patent Document 1. .

  Since the lower end portion of the non-circular lens L3 is only locked to the locking portion 18 as described above, the two holding portions 10b of the three holding portions 10a, 10b, 10c, 10c is provided at a position near the lower end corner.

  Also, as shown in FIG. 1A, by making the non-circular lens L3 a semicircular cut lens, the height dimension H can be shortened to H1 compared to the case of using a circular lens, and the projector device The height in the installation state of 2 can be made compact.

  A second embodiment will be described with reference to FIGS. Note that the same parts as those in the above embodiment (including parts that can be regarded as the same) are denoted by the same reference numerals, and unless otherwise specified, the description of the configuration and functions already described is omitted, and only the main parts are described.

  FIG. 6 shows the lens holding member 8 in a state where the lenses L1, L2, and L3 are not held. As shown in FIG. 7, a convex portion 16 a is formed on the inner surface of the second restricting portion 16 of the holding portion 10 so as to protrude so as to narrow the insertion opening of the accommodating concave portion. When the edge portion L3-1 is inserted due to the presence of the convex portion 16a, the elastic deformation of the second restricting portion 16 increases, and the edge portion L3-1 of the non-circular lens L3 is pressed and held with a stronger elastic force.

  As shown in FIG. 8, a slit 20 is formed on the side surface of the third accommodating portion 8d, and a portion 8d-1 having a trapezoidal locking portion 18 is separated. Accordingly, the portion 8d-1 having the locking portion 18 can be elastically deformed in the radial direction independently of other portions of the side surface of the third housing portion 8d.

  Thereby, the latching | locking part 18 which mounts the lower end of the edge part L3-1 can be urged | biased to radial direction, and the drop-off prevention function of the non-circular lens L3 can be improved.

2 Projector device 4 Lens unit 8 Lens holding member 10 Holding part 18 Locking part AX Optical axis L3 Non-circular lens L3-1 Edge part as outer peripheral end part

Claims (6)

In a lens holding member that holds a non-circular lens,
The non-circular lens can be moved in a radial direction perpendicular to the lens optical axis and an outer peripheral end thereof can be inserted, and a radial position perpendicular to the lens optical axis of the outer peripheral end and a position in the lens optical axis direction are A holding part that regulates,
A lens holder, comprising: a locking portion for preventing the non-circular lens from dropping in the radial direction in a state where an outer peripheral end portion of the non-circular lens is inserted into the holding portion. Element. The lens holding member according to claim 1,
The lens holding member, wherein the holding portion is elastically deformable, and holds the outer peripheral end portion with an elastic force when the outer peripheral end portion of the non-circular lens is inserted into the holding portion. The lens holding member according to claim 1 or 2,
The lens holding member, wherein the locking portion has a protrusion or convex shape that locks the lower end of the non-circular lens. The lens holding member according to claim 3,
The lens holding member, wherein the portion having the locking portion is elastically deformable in the radial direction independently of other portions.   A lens unit comprising the lens holding member according to claim 1.   A projector apparatus comprising the lens holding member according to claim 1.

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