JP2008139443A - Optical element mounting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the surface of an optical element from being damaged in a mounting process. <P>SOLUTION: An optical element side abutting piece 53 is located at a position where it does not come into contact with the surface 1A of the optical element 1, because the protrusion 21 of a holding frame 17 abuts on a part other than the engaging hole 59 of a clip member 51 until the clip member 51 holds the optical element 1 and the holding frame 17 and is inserted into an insertion completing position where the optical element 1 is fixed in the holding frame 17. In the insertion stage of the clip member 51, the optical element side abutting piece 53 does not slide on the surface 1A of the optical element 1, and the optical element side abutting piece 53 only abuts on the surface 1A of the optical element 1 when the clip member 51 is inserted into the insertion completing position and the protrusion 21 is fit in the engaging hole 59. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical element mounting structure used in an optical system, and more particularly to an optical element mounting structure such as a mirror and a deflection plate of a projector.

In an optical system such as a projector, as an attachment structure for attaching a plate-like optical element such as a mirror or a deflecting plate to a holding member such as a holding frame, the overlapping portion of the outer edge portion of the optical element and the holding member has a spring property. An optical element is integrally fixed to a holding member by being sandwiched by a U-shaped clip (for example, Patent Document 1), and a holding groove having a U-shaped cross section formed on the holding member at the outer edge of the optical element The elastic member is disposed between one inner wall surface of the holding groove and one surface of the optical element, and the wedge member is inserted between the other surface of the optical element and the other inner wall surface of the holding groove. Thus, there is one in which the optical element is integrally fixed to the holding member by pressing one surface of the optical element against one inner wall surface side of the holding groove with the elastic member interposed therebetween (for example, Patent Document 2). .
Japanese Patent Laid-Open No. 11-242186 JP 2002-90876 A

  By the way, in the conventional optical element mounting structure as described above, the clip or wedge member is slid on the surface of the optical element and pushed to a predetermined position during the mounting process. There is a problem that the coat film is damaged and peeled off.

  Such damage and corrosion due to damage may grow to the optical working area of the optical element in the course of use of the optical system, and cause deterioration of the optical performance of the optical system.

  The present invention has been made to solve the above-mentioned problems in the conventional optical element mounting structure, and does not damage the surface of the optical element during the mounting process, thereby stabilizing the optical performance of the optical system. An object of the present invention is to provide an optical element mounting structure for guaranteeing.

  In the optical element mounting structure according to the present invention, a locking member is inserted into the overlapping portion of the optical element and the holding member from the outside of the overlapping portion, and the optical element and the An optical element mounting structure for attaching the optical element to the holding member by sandwiching the holding member, wherein the locking member includes the optical element side contact piece and the optical element on the side opposite to the surface of the optical element. A holding member-side contact piece that contacts the back surface of the holding member; and an urging portion that urges the optical element-side contact piece and the holding member-side contact piece toward each other. The member includes an edge width portion that is located outside the overlapping portion and faces the holding member side contact piece, and the optical element side contact piece of the locking member and the holding member that face each other. On one side with the edge width of The concave portion is formed on the other side so that the convex portion can receive the convex portion, and the convex portion is the concave portion until the locking member passes through the edge width portion of the holding member and is inserted into the insertion completion position. The optical element side contact piece is positioned at a position where the optical element side contact piece does not contact the surface of the optical element against the urging force by the urging portion, and the locking member is inserted into the insertion portion. By being inserted into the completion position, the convex portion fits into the concave portion, and the fitting causes the optical element side contact piece to approach the holding member side contact piece by the biasing force of the biasing portion. The optical element side contact piece is configured to contact the surface of the optical element by the displacement.

  In the optical element mounting structure according to the present invention, more preferably, at the insertion completion position, the convex portion and the concave portion are non-reversely engaged without a gap in the insertion direction of the locking member with respect to the holding member. Or the check engagement between the convex portion and the concave portion, and the engagement of the engaging member with the outermost portion of the holding member at a portion straddling the outermost portion of the holding member. The stop member is attached to the holding member without including rattling in the insertion direction with respect to the holding member.

  In the optical element mounting structure according to the present invention, preferably, in the locking member, the optical element side abutting piece and the holding member side abutting piece form a pair of leg pieces, both of which are formed by the urging portion. It is the U-shaped clip member which has the spring property connected mutually.

  According to the optical element mounting structure of the present invention, the convex portion is located at a portion other than the concave portion until the locking member is inserted into the insertion completion position that sandwiches the optical element and the holding member and fixes the optical element to the holding member. Since the abutting piece on the optical element side is positioned so as not to contact the surface of the optical element due to the abutting, the abutting piece on the optical element side of the locking member is inserted in the process of inserting the locking member into the insertion completion position. The piece does not rub (slide) on the surface of the optical element, and the locking member is inserted into the insertion completion position and the convex part is fitted into the concave part. By this contact, the locking member fixes the optical element to the holding member.

  As a result, the optical element can be fixed to the holding member by the locking member without damaging the surface of the optical element during the mounting process, and the optical performance of the optical system is stably guaranteed.

  Furthermore, it is preferable that, at the insertion completion position, the locking member is mounted on the holding member without including any rattling in the insertion direction with respect to the holding member, so that the optical system is transported and used after the mounting process. However, the optical element side abutting piece of the locking member does not rub against the surface of the optical element due to vibration or the like, and the optical performance of the optical system is stably guaranteed.

    One embodiment of the optical element mounting structure according to the present invention will be described with reference to FIGS.

  This embodiment is an optical element mounting structure in which a plate-like optical element 1 such as a mirror or a deflection plate in an optical system is fixedly attached to a holding member indicated by reference numeral 11 in FIG.

  The holding member 11 includes a bottom plate portion 13 and a holding frame portion 17 including two left and right column portions 15 provided upright from the bottom plate portion 13. The optical element 1 is fixed to the holding member 11 in a sandwiching manner by U-shaped clip members 51 having the same structure in two upper and lower portions of each of the two left and right column portions 15.

  The attachment structure of the optical element 1 by the clip members 51 in a total of four places is the same structure, and one of them will be described in detail with reference to FIGS.

  As shown in FIGS. 2A to 2C, this mounting structure is formed on the overlapping portion A (see FIG. 2C) of the optical element 1 and the holding frame portion 17. The clip member 51 is inserted so as to straddle the outermost portion 15A of the column portion 15 from the outer side of A (right side as viewed in FIG. 2).

  The clip member 51 includes an optical element side contact piece 53, a holding member side contact piece 55, and an urging portion 57, and the optical element side contact piece 53, the holding member side contact piece 55, and Forms a pair of leg pieces with a predetermined width, and a biasing portion 57 having a curved shape with a predetermined width connects the optical element side contact piece 53 and the holding member side contact piece 55 to each other, in a direction in which the two come close to each other. A U-shape having a spring property to be urged is formed as a whole by a metal plate, plastic or the like.

  The U-shape referred to here includes a shape approximate to a U-shape and a U-shape, and exhibits a spring property that brings the optical element side contact piece 53 and the holding member side contact piece 55 close to each other. Any shape can be used.

  As shown in FIG. 2C, the clip member 51 at the insertion completion position is such that the tip 53A of the optical element side contact piece 53 contacts the surface 1A of the optical element 1 in the overlapping portion A. The substantially entire holding member-side contact piece 55 contacts the back surface (back surface) 17A of the holding frame portion 17 including the back surface of the column portion 15 on the opposite side of the front surface 1A of the optical element 1. The clip member 51 includes the front end portion 53A of the holding member side contact piece 55 and the holding member side contact piece 55, which are held by the urging force (spring force) of the urging portion 57, respectively, on the surface 1A of the optical element 1. By being pressed against the back surface 17 </ b> A of the frame portion 17, the optical element 1 and the holding frame portion 17 are sandwiched, and the optical element 1 is attached to the holding frame portion 17 integrally.

  The holding frame portion 17 has an edge width portion (outside the overlapping portion A, between the overlapping portion A and the outermost portion 15A of the column portion 15, facing the holding member side contact piece 53 of the clip member 51 ( Edge surface portion) 19. In this embodiment, the edge width portion 19 is formed by the column portion 15.

  A convex portion 21 is formed on the edge width portion 19 of the holding frame portion 17. The convex portion 21 is a protrusion having an unequal trapezoidal side surface shape (rectangular shape is a rectangular shape) and is integrally formed with the edge width portion 19, and is the front side in the clip insertion direction (right side as viewed in FIG. 2), that is, The outer portion 15A side has a gently sloping surface 23 and the back side in the clip insertion direction (left side in FIG. 2), that is, the overlapping portion A has a check shape of a steeply inclined surface 25 close to a vertical surface.

  Specifically, the optical element side abutting piece 53 of the clip member 51 is the same as the planar shape of the convex portion 21 as a concave portion that can receive the convex portion 21 on the biasing portion 57 side from the distal end portion 53A (complementary shape). ) Rectangular engagement holes 59 are formed. As shown in FIG. 2C, the protrusion 21 and the engagement hole 59 are aligned with each other at the insertion completion position of the clip member 51, and the protrusion 21 fits into the engagement hole 59. As the recess 21, instead of the engagement hole 59, a part of the clip member 51 that is plastically deformed by a press, for example, may be employed.

  The clip member 51 having the engagement hole 59 can be manufactured at low cost by stamping and bending by pressing and integral molding by plastic molding.

  The steeply inclined surface 25 of the convex portion 21 is a vertical surface as a whole, or, as indicated by reference numeral 25A in FIG. 3, only the upper side is a guide inclined surface, and the lower side to which the engaging hole 59 is fitted is shown. It may be a vertical surface. The steeply inclined surface 25 may be a guide arc surface on the upper side and a surface close to a vertical surface on the lower side, as indicated by reference numeral 25B in FIG. Further, as indicated by reference numeral 25C in FIG. 3, the upper side may be a guide inclined surface and the lower side may be an acute angle surface (the base angle γ of the steeply inclined surface 25 may be an obtuse angle). ).

  As shown in FIG. 2A, the clip member 51 is arranged so that the clip member 51 straddles the outermost portion 15 </ b> A of the column portion 15 from the outside of the overlapping portion A (right side in FIG. 2). , Inserted in the left direction as seen in FIG.

  Until the clip member 51 passes through the edge width portion 19 and is inserted into the insertion completion position shown in FIG. 2C, the optical element of the clip member 51 is shown in FIG. The front end portion 53A of the side contact piece 53 slides on the gently inclined surface 23 of the convex portion 21 and rides on the top portion 27 of the convex portion 21, and the convex portion 21 is a portion other than the engagement hole 59 of the optical element side contact piece 53 ( Since the optical element side contact piece 53 is in contact with the front end portion 53 </ b> A) of the optical element side contact piece 53, the optical element side contact piece 53 is moved away from the surface 1 </ b> A of the optical element 1 against the urging force of the urging portion 57. Is displaced.

  Thereby, in the insertion process of the clip member 51, the optical element side abutting piece 53 is located far from the surface 1A of the optical element 1 and is not in contact with the surface 1A of the optical element 1 from the beginning. In the insertion process, the optical element side contact piece 53 does not slide or rub on the surface 1A of the optical element 1.

  This ensures that the optical performance of the optical system is stable without damaging the surface 1A of the optical element 1 during the mounting process.

  Note that the holding member side abutting piece 55 abuts against the back surface 17A of the holding frame portion 17 throughout the insertion process of the clip member 51 and slides on the back surface 17A. Since the holding frame portion 17 is not optical, even if the back surface 17A is scratched, it does not deteriorate the optical performance of the optical system, and even if it is scratched, it is fine. The mechanical strength of the holding frame part 17 is not reduced.

  Then, as shown in FIG. 2C, when the clip member 51 is inserted into the normal insertion completion position, the engagement hole 59 and the projection 21 are aligned and the projection 21 is the engagement hole. 59 and engages with the holding frame portion 17 in a non-return manner. By fitting the projection 21 and the engagement hole 59, the urging force of the urging portion 57 displaces the optical element side contact piece 53 in a direction approaching the holding member side contact piece 55, and this displacement causes the optical element side contact piece 53 to move closer to the optical element side. The tip 53A of the contact piece 53 contacts the surface 1A of the optical element 1. Thereby, the optical element 1 is fixed to the holding member 11 by the clip member 51 in a sandwiching manner.

  As shown in FIG. 2A, a female screw hole 31 is formed through the overlapping portion A of the holding frame portion 17. An adjusting male screw member 33 is screwed into the female screw hole 31. The adjusting male screw member 33 is in contact with the back surface 1B of the optical element 1 so that the arrangement position of the optical element 1 in the thickness direction with respect to the holding frame portion 17 can be adjusted according to the screwing amount.

  Here, in this mounting structure, another important thing is that there is no deterioration over time and the optical performance of the optical system is ensured stably over a long period of time. Even in the course of use, the tip 53A of the optical element side contact piece 53 of the clip member 51 does not rub the surface 1A of the optical element 1 due to vibration or the like.

  On the other hand, in this embodiment, as shown in FIG. 2C, the length dimension La of the protrusion 21 in the clip insertion direction and the length dimension of the engagement hole 59 in the clip insertion direction. Lb has the same dimensions.

  As a result, at the insertion completion position, the convex portion 21 and the engagement hole 59 are reversely engaged without a gap in the insertion direction of the clip member 51 with respect to the holding frame portion 17, and the clip member 51 is engaged with the holding frame portion 17. On the other hand, it is mounted without including rattling in the clip insertion direction. That is, the clip member 51 does not rattle in the clip insertion direction with respect to the holding frame portion 17 in the pinching completed state.

  Accordingly, the tip 53A of the optical element side contact piece 53 of the clip member 51 does not rub against the surface 1A of the optical element 1 due to vibration or the like during the transport process and use process of the optical system after the mounting process. The optical performance of the system is guaranteed to be stable over a long period of time.

  FIG. 4 shows a number of embodiments with a structure in which the clip member 51 does not rattle in the clip insertion direction with respect to the holding frame portion 17 in the pinching completed state.

  In this embodiment, the length Lc in the clip insertion direction between the outermost portion 15A of the column portion 15 and the steeply inclined surface 25 of the convex portion 21 and the innermost portion 57A of the urging portion 57 of the clip member 51 are engaged. The length dimension Ld in the clip insertion direction with the front side 59A in the clip insertion direction of the hole 59 is the same dimension.

  As a result, at the position where the clip member 51 straddles the outermost portion 15A of the column portion 15 at the insertion completion position, the outermost portion 15A of the column portion 15 and the innermost portion 57A of the urging portion 57 of the clip member 51 contact each other. The clip member 51 is brought into contact by this contact and non-return engagement between the convex portion 21 and the engagement hole 59 (contact between the steeply inclined surface 25 of the convex portion 21 and the front side 59A of the engagement hole 59). The clip is attached to the holding frame portion 17 without any backlash in the clip insertion direction. That is, the clip member 51 does not rattle in the clip insertion direction with respect to the holding frame portion 17 in the pinching completed state.

  Thereby, also in this embodiment, the tip end portion 53A of the optical element side contact piece 53 of the clip member 51 rubs the surface 1A of the optical element 1 by vibration or the like during the transport process and use process of the optical system after the mounting process. Therefore, the optical performance of the optical system is guaranteed to be stable over a long period of time.

  In this embodiment, the length dimension (Lb) of the engagement hole 59 in the clip insertion direction may be slightly longer than the length dimension (La) of the protrusion 21 in the clip insertion direction.

  FIG. 5 shows another embodiment in which a compression coil spring 35 is provided on the outermost portion 15A of the column portion 15, and the clip member 51 at the insertion completion position is inserted by the spring force of the compression coil spring 35. It is biased in the reverse direction (right direction as viewed in FIG. 5). Accordingly, the front side 59 </ b> A of the engagement hole 59 is pressed against the steeply inclined surface 25 of the convex portion 21, so that the clip member 51 does not rattle with respect to the holding frame portion 17 in the clip insertion direction.

  Thereby, also in this embodiment, the tip end portion 53A of the optical element side contact piece 53 of the clip member 51 rubs the surface 1A of the optical element 1 by vibration or the like during the transport process and use process of the optical system after the mounting process. Therefore, the optical performance of the optical system is guaranteed to be stable over a long period of time.

  The urging force in the direction opposite to the inserting direction of the clip member 51 at the insertion completion position is integrally formed with the urging portion 57 of the clip member 51 as shown in FIG. It is also possible to use the spring piece 61.

  The spring piece 61 can be formed by cutting and raising processing (louver processing) in press processing, or by integral molding in plastic molding.

  In the above-described embodiment, the convex portion 21 is provided in the holding frame portion 17 and the engaging hole 59 that is a concave portion is provided in the clip member 51. However, the convex portion and the concave portion are formed in the holding frame portion 17 and the clip member 51. On the other hand, it can be arranged in reverse. An embodiment of this reverse arrangement will be described with reference to FIG. 7, parts corresponding to those in FIG. 2 are denoted by the same reference numerals as those in FIG. 1 as in FIGS.

  In this embodiment, a check engagement piece 63 is integrally formed as a convex portion on the side of the urging portion 57 from the distal end portion 53 </ b> A of the optical element side contact piece 53 of the clip member 51. The edge width portion 19 of the holding frame portion 17 is formed with a check-shaped recess 37 for receiving the check engagement piece 63.

  In this embodiment, until the clip member 51 passes through the edge width portion 19 and is inserted into the insertion completion position, the check engagement piece 63 on the optical element side contact piece 53 of the clip member 51 is the edge width portion 19. Since the optical element side contact piece 53 is in contact with a portion other than the concave portion 37 of the holding frame portion 17, the optical element side contact piece 53 resists the urging force of the urging portion 57. The optical element 1 is displaced away from the surface 1A of the optical element 1.

  Thereby, also in this embodiment, in the insertion process of the clip member 51, the optical element side contact piece 53 is located at a position where it is far from the surface 1A of the optical element 1 and does not contact the surface 1A of the optical element 1 from the beginning. In the insertion process of the clip member 51, the optical element side contact piece 53 does not slide or rub on the surface 1A of the optical element 1.

  This ensures that the optical performance of the optical system is stable without damaging the surface 1A of the optical element 1 during the mounting process.

  When the clip member 51 is inserted into the proper insertion completion position, the check engagement piece 63 and the recess 37 are aligned with each other, and the check engagement piece 63 is fitted into the recess 37, so that the holding frame portion 17 is fixed. Engage with check. By fitting the check engagement piece 63 and the recess 37, the urging force of the urging portion 57 displaces the optical element side contact piece 53 toward the holding member side contact piece 55, and this displacement causes the optical element to move. The front end 53 </ b> A of the side contact piece 53 contacts the surface 1 </ b> A of the optical element 1. Thereby, the optical element 1 is fixed to the holding member 11 by the clip member 51 in a sandwiching manner.

  The check engagement piece 63 can be formed by cutting and raising processing (louver processing) in press processing, or by integral molding in plastic molding.

  In this embodiment, the structure that prevents the clip member 51 from rattling in the clip insertion direction with respect to the holding frame portion 17 in the state where the clamping has been completed is the same as that of the embodiment of FIG. However, it is also possible to have a configuration equivalent to the embodiment shown in FIGS.

1 is an overall perspective view showing one embodiment of an optical element mounting structure according to the present invention. (A)-(c) is an enlarged view of the principal part which shows the attachment process of one Embodiment of the optical element attachment structure by this invention. It is an enlarged view which shows the convex shape of the optical element attachment structure by this invention. It is an enlarged view which shows the principal part of other embodiment of the optical element attachment structure by this invention. It is an enlarged view which shows the principal part of other embodiment of the optical element attachment structure by this invention. It is an enlarged view which shows the principal part of other embodiment of the optical element attachment structure by this invention. It is an enlarged view which shows the principal part of other embodiment of the optical element attachment structure by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical element 11 Holding member 13 Bottom plate part 15 Column part 17 Holding frame part 19 Edge width part 21 Convex part 23 Slightly inclined surface 25 Steeply inclined surface 27 Top part 31 Female screw hole 33 Adjustment male screw member 35 Compression coil spring 37 Recessed part 51 Clip member 53 Optical element side contact piece 55 Holding member side contact piece 57 Energizing part 59 Engagement hole 61 Spring piece 63 Non-return engagement piece A Overlapping part

Claims (4)

A locking member is inserted into the overlapping portion of the optical element and the holding member from the outside of the overlapping portion, and the optical element and the holding member are sandwiched by the locking member at the insertion completion position. An optical element mounting structure for mounting an optical element to the holding member,
The locking member includes an optical element-side contact piece, a holding member-side contact piece that contacts the back surface of the holding member opposite to the surface of the optical element, the optical element-side contact piece, and the holding member. An urging portion that urges the member side contact pieces in a direction to approach each other;
The holding member includes an edge width portion that is located outside the overlapping portion and faces the holding member side contact piece,
A convex portion is formed on one of the optical element side contact piece of the locking member and the edge width portion of the holding member facing each other, and a concave portion that can receive the convex portion is formed on the other,
Until the locking member passes through the edge width portion of the holding member and is inserted into the insertion completion position, the convex portion is in contact with a portion other than the concave portion. Positioned at a position where the optical element side contact piece does not contact the surface of the optical element against the force,
When the locking member is inserted into the insertion completion position, the convex portion fits into the concave portion, and the fitting causes the optical element side contact piece to be held on the holding member side by the biasing force by the biasing portion. An optical element mounting structure, wherein the optical element mounting structure is configured to displace in a direction approaching the contact piece, and the displacement causes the optical element side contact piece to contact the surface of the optical element.   In the insertion completion position, the protrusion and the recess are non-reversely engaged without a gap in the insertion direction of the locking member with respect to the holding member, so that the locking member is engaged with the holding member. The optical element mounting structure according to claim 1, wherein the optical element mounting structure is mounted on the holding member without including any shakiness in the insertion direction.   In the insertion completion position, the non-return engagement between the convex portion and the concave portion, and the locking member abuts on the outermost portion of the holding member at a portion straddling the outermost portion of the holding member, The optical element mounting structure according to claim 2, wherein the locking member is attached to the holding member without including a rattling in the insertion direction with respect to the holding member.   The locking member is a U-shaped clip having a spring property in which the optical element side contact piece and the holding member side contact piece form a pair of leg pieces, and the both are connected to each other by the biasing portion. The optical element mounting structure according to any one of claims 1 to 3, wherein the optical element mounting structure is a member.

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