JP2009053620A - Light-quantity control blade and manufacturing method of the light-quantity control blade - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light-quantity control blade, wherein tact time is shortened and the thinning is attained, while maintaining the dimensional accuracy. <P>SOLUTION: An aperture blade 1 includes: a light-shielding member 10, which essentially consists of a laser beam absorbing resin and intercepts a beam; a filter member 20, which essentially consists a laser beam transmitting resin and imparts a prescribed transmittance to the optical flux; and a fusion part 30, which is formed between the light-shielding member 10 and the filter member 20 and in which the light-shielding member 10 and the filter member 20 are fused to each other. The fusion part 30 is formed, by irradiating a contact face between the edge surface of the light-shielding member 10 and the edge surface of the filter member 20 with the laser beam transmitted through the filter member 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a light amount adjusting blade used in an optical apparatus such as a camera, a video camera, and a digital camera, and a method for manufacturing the light amount adjusting blade, and in particular, a light amount adjusting blade having an optical filter as a filter member and the light amount adjusting blade. It relates to a manufacturing method.

  Conventional cameras such as video cameras and digital cameras with a built-in solid-state image sensor, and cameras that use a film, to check the depth of focus of the lens and adjust the amount of light on the subject imaged on the film or solid-state image sensor A diaphragm device (light quantity adjusting device) for controlling the aperture diameter is provided. Normally, the amount of light passing through is controlled by the aperture device, but for high-luminance subjects, the aperture diameter is maintained at a predetermined value without making it too small to prevent degradation of resolution due to diffraction. Instead, the amount of passing light is limited using an optical filter such as a neutral density filter (hereinafter referred to as an ND filter). As a result, deterioration in image quality is prevented.

  For example, as shown in FIG. 5, there is a diaphragm blade 50 including a diaphragm blade body 51 and an ND filter 52 bonded to a part of the diaphragm blade body 51 with an adhesive 53. In normal times, the ND filter bonded to the diaphragm blade 50 is located at a position retracted from the optical axis, and the amount of passing light is controlled using the two diaphragm blade bodies 51. When the subject has high brightness, the diaphragm diameter defined by the two diaphragm blade bodies 51 is maintained at a predetermined value. Instead, the diaphragm blade 50 is operated, and the ND filter 52 bonded to the diaphragm blade 50 is used. The amount of passing light is limited by being positioned on the optical axis.

Here, in the diaphragm blade 50, the ND filter 52, which is a separate member, is bonded to the diaphragm blade body 51. Therefore, when the ND filter 52 is bonded to the diaphragm blade, displacement occurs or the shape of the ND filter 52 is changed. There are disadvantages such as lack of freedom. In order to solve this problem, a light quantity adjustment blade in which the diaphragm blade body and the ND filter are integrated has been proposed. Specifically, as shown in FIG. 6, the light quantity adjustment blade 60 is integrally formed so as to have a region 60 a functioning as a diaphragm blade and a region 60 b functioning as an ND filter in the same base material. (For example, refer to Patent Document 1). As a manufacturing method of the light quantity adjusting blade 60, first, electroless nickel plating is performed in a state where PET or PEN is used as a base material and the ND filter region 60b is masked. Then, the area | region 60a which functions as an aperture blade is formed by spray-coating a polyamidoimide resin solution. Furthermore, the ND filter region 60b is formed by performing vapor deposition on the base material in a state where light is shielded by the Al plate except for the ND filter region 60b.
JP-A-11-190866

  However, in the light quantity adjusting blade as described above, a plurality of manufacturing processes must be provided, and since it takes time to perform masking and removal, the manufacturing time (tact time) becomes long, resulting in a low manufacturing cost. There is a problem of increasing. In recent years, with the reduction in the size and weight of optical devices, there has been a demand for thinner light amount adjustment blades.

  An object of the present invention is to provide a light quantity adjusting blade capable of shortening a tact time and realizing a reduction in thickness while maintaining dimensional accuracy, and a method for manufacturing the same.

  In order to achieve the above object, the light quantity adjusting blade according to claim 1 is mainly composed of a laser light-absorbing resin, a plate-shaped light shielding member for blocking the light beam, a laser light-transmitting resin as a main component, and a light beam. A plate-like filter member that gives a predetermined transmittance to the filter member, and a fusion formed between the light-shielding member and the filter member by laser light transmitted through the filter member, and fusing the light-shielding member and the filter member together And a section.

  The method of manufacturing a light quantity adjusting blade according to claim 7 includes a plate-shaped light-shielding member that contains a laser light-absorbing resin as a main component and blocks a light beam, and a laser light-transmitting resin as a main component, and a predetermined transmittance for the light beam. A plate-shaped filter member for providing a light amount adjusting blade, and irradiating a contact surface between an end surface of the light shielding member and an end surface of the filter member with laser light transmitted through the filter member, The light shielding member and the filter member are fused to each other.

  According to the present invention, the laser beam transmitted through the filter member is applied to the contact surface between the end surface of the light shielding member mainly containing the laser light absorbing resin and the end surface of the filter member mainly containing the laser light transmitting resin. Irradiation and a fusion part for fusing the light shielding member and the filter member between the light shielding member and the filter member are formed, so that the thickness of the light quantity adjusting blade can be reduced. Moreover, since the light shielding member and the filter member are fused with laser light, when manufacturing the light quantity adjusting blade, the dimensional accuracy of each member can be maintained, and a complicated process such as masking is not required. The light shielding member and the filter member can be fused in a short production time. Therefore, the tact time can be shortened and the thickness can be reduced while maintaining the dimensional accuracy.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1A and 1B are diagrams schematically showing a light amount adjustment blade according to an embodiment of the present invention, in which FIG. 1A is a plan view, and FIG. 1B is along a line segment AA in FIG. It is a fragmentary sectional view. In the present embodiment, description will be made by taking, as an example, a diaphragm blade of a diaphragm device used in a video camera or the like as a light amount adjusting blade.

  1 (a) and 1 (b), a diaphragm blade 1 as a light quantity adjusting blade has a laser light absorbing resin as a main component, a light shielding member 10 that blocks a light beam, and a laser light transmissive resin as a main component. A filter member 20 that gives a predetermined transmittance to the light beam, and a fusion part 30 that is formed between the light shielding member 10 and the filter member 20 and to which the light shielding member 10 and the filter member 20 are fused together.

  Specifically, the light shielding member 10 is made of a laser light absorbing resin containing a black paint or the like, and is manufactured by stamping a sheet material made of a laser light absorbing resin such as PET, polycarbonate (PC), ABS, or the like by pressing. Is done. In FIGS. 1A and 1B, the light shielding member 10 is not colored in order to clarify the boundary with the filter member 20, but the light shielding member 10 is a member that blocks light. Actually it is black.

  The filter member 20 includes a thin plate-shaped base material 21 made of a laser light transmitting resin and a filter layer 22 laminated on the main surface of the base material 21. The filter member 20 is produced by vapor-depositing a material such as TiOx that becomes the filter layer 22 on a base material 21 made of polyethylene terephthalate (hereinafter referred to as PET) or polyethylene naphthalate (hereinafter referred to as PEN).

  The fused part 30 is formed by irradiating the contact surface between the end face of the light shielding member 10 and the end face of the filter member 20 with the laser light transmitted through the filter member 20. In the present embodiment, the fusion part 30 is a fusion layer formed along a plane perpendicular to the main surface of the light shielding member 10.

  2A and 2B are diagrams for explaining a method of manufacturing the diaphragm blade 1 of FIG. 1, in which FIG. 2A shows the first step, FIG. 2B shows the second step, and FIG. 2C shows the third step.

  2A to 2C, first, a laser light-absorbing resin sheet material containing a black paint or the like is punched into a predetermined shape by pressing to produce a light shielding member 10 having a thickness T1. Further, a plate-like body made of PET or PEN on which a material such as TiOx is vapor-deposited is cut into a substantially triangular shape, and the filter member 20 having a thickness T2 is produced. In the present embodiment, the thickness T1 of the light shielding member 10 and the thickness T2 of the filter member 20 have a relationship of T1 = T2.

  Next, the filter member 20 is not brought into contact with the light shielding member 10 so that the thickness of the aperture blade 1 becomes (T1 + T2), but the filter member 20 is adjusted so that the thickness of the aperture blade 1 becomes T1 (= T2). The light shielding member 10 is brought into contact. That is, the filter member 20 and the light shielding member 10 are not overlapped in the thickness direction, but the end surface of the filter member 20 having the thickness T2 is brought into contact with the end surface of the light shielding member 10 having the thickness T1. At this time, the end surface of the light shielding member 10 has a contact surface 10 a that is a surface perpendicular to the main surface of the light shielding member 10 and contacts a contact surface 20 a of the filter member 20 described later. Further, the end surface of the filter member 20 has a contact surface 20a that is a surface perpendicular to the main surface of the filter member 20 and that contacts the contact surface 10a of the light shielding member 10 (FIG. 2A).

  Thereafter, the filter member 20 and the light shielding member 10 are bonded to a glass plate or the like in a state where the filter member 20 is pressure-bonded to the light shielding member 10 so as to maintain the state where the contact surface 10a and the contact surface 20a are in contact with each other. Fix with the used jig 25.

  Next, the laser beam transmitted through the filter member 20 is irradiated to the contact surface where the end surface of the light shielding member 10 contacts the end surface of the filter member 20. Specifically, laser light is irradiated obliquely with respect to the main surface of the filter member 20 from above the filter member 20 using a laser irradiation device (not shown), and the laser light is irradiated onto the contact surface 10a of the light shielding member 10. (FIG. 2B). The laser light passes through the base material 21 of the filter member 20 and is irradiated onto the contact surface 10a of the light shielding member 10 on a line. In this embodiment, the laser beam transmitted through the filter member 20 is irradiated on the contact surface 10a of the light shielding member 10 on a line, but spots (points) are formed on at least a part of the contact surface 10a of the light shielding member 10. You may irradiate with.

  The laser light applied to the contact surface 10 a passes through the base material 21 of the filter member 20 and is absorbed by the light shielding member 10. At this time, the laser light absorbed by the contact surface 10a is accumulated as energy, and as a result, the contact surface 10a on the light shielding member 10 side is heated and melted, and heat transfer from the light shielding member 10 causes the filter member 20 to The contact surface 20a is heated and melted. Thereafter, the heat-melted contact surface 10a and the contact surface 20a are cooled to form a fusion layer 30 between the light shielding member 10 and the filter member 20 (FIG. 2C). The member 20 and the light shielding member 10 are fused (joined) to each other.

  According to the present embodiment, the laser light transmitted through the filter member 20 is divided into the end face of the light shielding member 10 mainly composed of a laser light absorbing resin and the end face of the filter member 20 mainly composed of the laser light transparent resin. The light shielding member 10 and the filter member 20 are fused by the fused portion 30 formed by the irradiation. That is, since the filter member 20 and the light shielding member 10 are not stacked in the thickness direction, when the light amount adjusting blade 1 is manufactured by integrating the filter member 20 and the light shielding member 10, the thickness of the light amount adjusting blade 1 is T1 (= T2). Thus, the thickness of the light quantity adjusting blade 1 can be reduced. Further, since the light shielding member 10 and the filter member 20 are fused by laser light, the dimensional accuracy of each member can be maintained, and a complicated process such as masking is required when manufacturing the light quantity adjusting blade 1. In addition, the light shielding member 10 and the filter member 20 can be fused in a short production time. Therefore, the tact time can be shortened and the thickness can be reduced while maintaining the dimensional accuracy.

  In the present embodiment, the filter layer 22 is formed by vapor-depositing a material such as TiOx on the base material 21; however, the filter layer 22 may be formed by painting a black material, and a colored liquid that turns black is used. It may be formed by an inkjet method (a method using a micro droplet discharge device), printing, or the like.

  In the present embodiment, the laser beam is irradiated from the base member 21 side of the filter member 20, but the present invention is not limited to this, and the laser beam may be irradiated from the filter layer 22 side.

  In this embodiment, PET, polycarbonate (PC), ABS or the like is used as the laser light absorbing resin, and PET or PEN or the like is used as the laser light transmissive resin. However, the present invention is not limited to this. Instead, other materials may be used, and other material combinations may be used.

  In the present embodiment, the thickness T1 of the light shielding member 10 and the thickness T2 of the filter member 20 have a relationship of T1 = T2, but may have a relationship of T1> T2 or T1 <T2. Good.

  FIG. 3 is a view showing a modification of the diaphragm blade 1 of FIG.

  In FIG. 3, a diaphragm blade 40 includes a light-shielding member 41 that mainly contains a laser light-absorbing resin and blocks a light beam, and a filter member 42 that mainly contains a laser light-transmitting resin and gives a predetermined transmittance to the light beam. The light shielding member 41 and the filter member 42 are formed between the light shielding member 41 and the filter member 42, and the light shielding member 41 and the filter member 42 are fused to each other. The filter member 42 includes a thin plate-shaped base material 43 made of a laser light transmitting resin and a filter layer 44 laminated on the main surface of the base material 43.

  In this modification, the end surface of the light shielding member 41 and the end surface of the filter member 42 have a stepped surface formed so as to be combined with each other. The stepped surface of the light shielding member 41 has a surface parallel to the main surface of the light shielding member 41. By irradiating a laser beam to a surface parallel to the main surface of the light shielding member 41, the fusion layer 45 is formed in parallel to the main surface of the light shielding member 41.

  According to this modification, laser light is irradiated to a surface parallel to the main surface of the light shielding member 41 among the stepped surfaces of the light shielding member 41 so as to be parallel to the main surface of the light shielding member 41. A fusing layer 45 is formed. That is, by making the end surface of the light shielding member 41 a stepped surface, the end surface of the light shielding member 41 can be irradiated with laser light at a right angle. Thereby, it is not necessary to arrange a laser irradiation device (not shown) obliquely, and the laser irradiation device, the filter member 42 and the light shielding member 41 can be easily arranged.

  In this modification, among the stepped surfaces of the light shielding member 41, the surface parallel to the main surface of the light shielding member 41 is irradiated with laser light, so that it is parallel to the main surface of the light shielding member 41. However, the present invention is not limited to this, and the laser beam is irradiated to a surface parallel to the main surface of the light shielding member 41 and further perpendicular to the main surface of the light shielding member 41. The surface may be irradiated with laser light. Thereby, the fusion strength between the light shielding member 41 and the filter member 42 can be further improved.

  In this modification, the end face of the light shielding member 41 and the end face of the filter member 42 have a single stepped shape. However, the present invention is not limited to this, and may have two or more stepped shapes.

  FIG. 4 is a view showing another modification of the diaphragm blade 1 of FIG.

  In FIG. 4, a diaphragm blade 50 includes a light-shielding member 51 that contains a laser light-absorbing resin as a main component and blocks a light beam, and a filter member 52 that mainly contains a laser light-transmitting resin and gives a predetermined transmittance to the light beam. The light shielding member 51 and the filter member 52 are formed between the light shielding member 51 and the filter member 52, and the light shielding member 51 and the filter member 52 are fused to each other. The filter member 52 includes a thin plate-like base material 53 made of a laser light transmitting resin, and a filter layer 54 laminated on the main surface of the base material 53.

  In the present modification, the end surface of the light shielding member 51 and the end surface of the filter member 52 are formed obliquely with respect to the main surface of the light shielding member 51. By irradiating the end face formed obliquely with respect to the main surface of the light shielding member 51 with laser light, the fusion layer 55 is formed obliquely with respect to the main surface of the light shielding member 51.

  According to this modification, the irradiation area of the laser beam can be increased by irradiating the end surface formed obliquely with respect to the main surface of the light shielding member 51 with the laser beam. Further, since the end surface of the light shielding member 51 and the end surface of the filter member 52 are formed obliquely with respect to the main surface of the light shielding member 51, the fusion strength between the light shielding member 51 and the filter member 52 can be further increased with a simple shape. Can be improved.

It is a figure which shows roughly the light quantity adjustment blade | wing which concerns on embodiment of this invention, (a) is a top view, (b) is a fragmentary sectional view in alignment with line segment AA of (a). is there. It is a figure explaining the manufacturing method of the aperture blade of FIG. 1, (a) shows a 1st process, (b) shows a 2nd process, (c) shows a 3rd process. It is a figure which shows the modification of the aperture blade of FIG. It is a figure which shows the other modification of the aperture blade of FIG. It is a figure which shows an example of the conventional aperture blade. It is a figure which shows an example of the conventional aperture blade.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Diaphragm blade 10 Light-shielding member 10a Contact surface 20 Filter member 20a Contact surface 21 Base material 22 Filter layer 25 Jig 30 Fusion part

Claims (9)

  A plate-shaped light-blocking member having a laser light-absorbing resin as a main component and blocking a light beam; a plate-shaped filter member having a laser light-transmitting resin as a main component and giving a predetermined transmittance to the light beam; and the filter member A light quantity adjusting blade, comprising: a fusion part that is formed between the light shielding member and the filter member by the transmitted laser light and that fuses the light shielding member and the filter member.   The said fusion | melting part is formed by irradiating the contact surface of the end surface of the said light shielding member, and the end surface of the said filter member with the laser beam which permeate | transmitted the said filter member. Light quantity adjustment blade.   The light quantity adjusting blade according to claim 1, wherein the filter member includes a thin plate-shaped base material made of a laser light transmitting resin and a filter layer laminated on the base material.   The light quantity adjusting blade according to claim 2, wherein the fusion part is a fusion layer formed along a plane perpendicular to the main surface of the light shielding member. The end surface of the light shielding member and the end surface of the filter member each have a stepped surface formed so as to be combined with each other.
4. The light quantity adjusting blade according to claim 2, wherein the fusion part is formed along a surface parallel to a main surface of the light shielding member of the stepped surface.   The light quantity adjusting blade according to claim 2, wherein the fusion part is a fusion layer formed obliquely with respect to a main surface of the light shielding member. A light amount adjusting blade comprising a plate-shaped light-shielding member mainly composed of a laser light-absorbing resin and blocking a light beam, and a plate-shaped filter member mainly composed of a laser light-transmitting resin and giving a predetermined transmittance to the light beam. A manufacturing method of
A laser beam transmitted through the filter member is applied to an abutting surface where an end surface of the light shielding member and an end surface of the filter member abut, and the light shielding member and the filter member are fused to each other. A manufacturing method of the adjusting blade.   The method of manufacturing a light quantity adjusting blade according to claim 7, wherein the laser light transmitted through the filter member is irradiated to a contact surface of the light shielding member.   9. The method of manufacturing a light quantity adjusting blade according to claim 8, wherein the laser light transmitted through the filter member is irradiated with a spot onto at least a part of the contact surface of the light shielding member.

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