JP5230154B2 - Light amount adjusting device and method of manufacturing the light amount adjusting device - Google Patents

Description

  The present invention relates to a light amount adjusting device 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 device, and more particularly, a light amount adjusting unit that is adjacent to another light amount adjusting blade and is rotatably provided. The present invention relates to a device and a method for manufacturing the light amount adjusting device.

  2. Description of the Related Art Conventionally, a light amount adjusting device used for a square-type focal plane shutter or a lens shutter used in a single-lens reflex type camera can be rotated with respect to a light amount adjusting blade that is a thin light shielding member and a light amount adjusting blade The light quantity is adjusted or blocked by rotating the drive member and performing the vertical movement and the rotational movement of the light quantity adjustment blade.

  The focal plane shutter includes a driving member called a driving arm and a light shielding blade rotatably supported at the tip of the driving member. The driving member and the light shielding blade constitute a parallel link mechanism, so that the light shielding blade Move in parallel up and down to adjust or block the amount of light.

  In addition, a diaphragm device as a light amount adjusting device used in a video camera includes a set of diaphragm blades (light amount adjusting blades) called an iris and an ND filter mechanism for adjusting the light amount of an opening. . In such an aperture device, an ND filter drive system in which a drive source independent of the operation of a set of aperture blades drives the ND filter, or a cam mechanism for linking the aperture blade drive source and the ND filter, is provided. A method is adopted in which the drive source moves the ND filter back and forth in the optical path via a cam mechanism. In the latter case, since the ND filter drive source is shared with the diaphragm blade drive source, there is a merit such as cost reduction. However, a link mechanism for linking the diaphragm blade and the ND filter, such as the cam mechanism, is required. .

  2. Description of the Related Art Conventionally, in a light amount adjusting device having such a link mechanism, a shaft member with a hook is passed through each hole provided in the driving member and the light amount adjusting blade so as to connect the driving member and the light amount adjusting blade in a rotatable manner. In this state, the shaft member is caulked. At this time, the end of the shaft member only slightly protrudes from the surface of the light quantity adjusting blade when the caulking process is normally performed, but when the caulking process is not performed normally, the light quantity adjusting device is operated. When it was made, the end part of a shaft member and the light quantity adjustment blade collided, and the problem that a light quantity adjustment device broke occurred, and, thereby, the reliability of the light quantity adjustment apparatus was reduced.

In order to solve this problem, as shown in FIGS. 8A and 8B, a recess 101a is provided in the vicinity of the outer periphery of the hole 103 of the light shielding blade 101 into which the caulking pin 102 is inserted (FIG. 8A). When the caulking pin 102 is caulked, the end of the caulking pin 102 enters the recess 101a (FIG. 8B), thereby preventing the end of the caulking pin 102 from protruding from the aperture blade 101. Has been proposed (see, for example, Patent Document 1). In recent years, a light amount adjusting blade has been proposed in which a conical shape is formed in a tool at the time of caulking, instead of forming a concave portion in advance, for reasons such as changes in the material of the light amount adjusting blade.
Japanese Examined Patent Publication No. 06-048341

  However, in the conventional light quantity adjusting blade, since the caulking pin is a minute member, it is difficult to maintain the positional accuracy of the tool during the caulking process, and when the light quantity adjusting device is mass-produced, the caulking process is performed. Since the tool used in the above deteriorates, it is difficult to always fit the end of the caulking pin in the recess. Therefore, there is a problem that the caulking pin cannot be reliably prevented from protruding from the back surface of the light amount adjusting blade, and is in contact with the adjacent light amount adjusting blade. In addition to the fact that the caulking pin is usually made of metal, there are about 4 light quantity adjustment blades for the front curtain and the rear curtain attached to the end of one drive member, so that the caulking pin made of metal Due to the weight of the pin and the moment of inertia, the operation time of the light quantity adjusting blade becomes long, and it is difficult to execute a high-speed shutter.

  An object of the present invention is to provide a light amount adjusting device that can prevent contact between adjacent light amount adjusting members by driving the light amount adjusting member at a high speed by attaching the light amount adjusting member to the driving member without using a caulking pin. It is to provide.

In order to achieve the above object, a light amount adjusting device of the present invention includes a light amount adjusting member, a driving member in which a hole is formed, and a shaft member in which a flange having a diameter larger than the hole is formed at one end. , the shaft member is formed by a laser light transmitting resin, from the light amount adjustment member is formed by laser-absorbing resin, the surface of the drive member said laser light transmitting resin and the laser-absorbing resin Is also covered with a material having a high melting point, the other end of the shaft member penetrating the hole is brought into contact with the light amount adjusting member, and the spot diameter in the contact region between the shaft member and the light amount adjusting member is The shaft member and the light amount adjusting member are fused by irradiating a laser beam smaller than the diameter of the member from the flange side of the shaft member .

The method of manufacturing a light amount adjusting device of the present invention includes a light amount adjusting member, a drive member in which a hole is formed, and a shaft member in which a flange having a diameter larger than the hole is formed at one end. The shaft member is formed of a laser light transmitting resin, the light amount adjusting member is formed of a laser light absorbing resin, and at least the surface of the driving member is formed on the laser light transmitting resin and the Cover with a material having a higher melting point than the laser light-absorbing resin, the other end of the shaft member penetrating the hole is brought into contact with the light amount adjusting member, and in a contact region between the shaft member and the light amount adjusting member By irradiating a laser beam having a spot diameter smaller than the diameter of the shaft member from the flange side of the shaft member, the shaft member and the light amount adjusting member are fused.

  According to the present invention, the shaft member does not protrude from the back surface of the light amount adjusting member at the joint portion between the shaft member and the light amount adjusting member. Further, since the shaft member is made of resin, the moment of inertia is smaller than that of a shaft member made of metal or the like, and the light amount adjusting member can be driven at a higher speed. Accordingly, it is possible to provide a light amount adjusting device that can prevent contact between the shaft member and the adjacent light amount adjusting member and can drive the light amount adjusting member at high speed.

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

  FIG. 1 is an external view schematically showing a configuration of a light quantity adjustment blade according to the first embodiment of the present invention, and FIG. 2 is an external view showing a configuration of the light quantity adjustment blade in FIG.

  In FIG. 1, a focal plane shutter 1 as a light amount adjusting device includes a shutter base plate 11, a substantially rectangular opening 11 a provided at the center of the shutter base plate 11, and a shaft (shaft member) formed on the shutter base plate 11. Drive arms (drive members) 21a and 21b that are rotatably attached to 13a and 13b, and shutter blades (light quantity adjusting members) 20 that are rotatably attached to the drive arms 21a and 21b are provided. Arc-shaped groove portions 14a and 14b are formed in the shutter base plate 11. The focal plane shutter 1 includes four shutter blades as a parallel link mechanism for the rear curtain, but the configuration of the other three shutter blades other than the shutter blade 20 is the same as that of the shutter blade 20, Description is omitted.

  A pair of drive arms 21a and 21b are pivotally supported on the shutter blade 20 by a pair of shaft members 23a and 23b, respectively (FIG. 2). As the pair of drive arms 21a and 21b rotate, the shutter blade 20 moves between a position where the opening 11a is closed and a position where the opening 11a is opened. In addition, 8 (4 sets) of drive arms are provided for the rear curtain, and when combined with the front curtain, 16 shutter arms are provided as a whole, but other drive arm configurations other than the pair of drive arms 21a and 21b are provided. Since this is the same as the pair of drive arms 21a and 21b, description thereof is omitted.

  FIG. 3 is a cross-sectional view of the joint portion between the shutter blade 20 and the drive arm 21a along the line AA in FIG. In addition, since the structure of the shaft member 23b is the same as that of the shaft member 23a, the description thereof is omitted.

  In FIG. 3, the shaft member 23a is a columnar shaft having a flange 24a at one end. The other end 25a of the shaft member 23a is fused to the main surface of the shutter blade 20 in a state of passing through a hole 24 of a drive arm 21a described later. As described above, since 16 drive arms are provided in the entire shutter device, the shutter blades 20 are rotatably supported by 16 shaft members.

  The shaft member 23a is made of a laser light transmitting resin, and is molded from a natural grade of PC (polycarbonate) such as transparent or white (not filled with other particles such as carbon).

  The drive arm 21 a includes a base material 31 made of a thermoplastic resin such as PET, PC, ABS, and a carbon layer 32 formed on the surface of the base material 31. Also, a hole 24 is provided at the end of the drive arm 21a, and the shaft member 23a is formed to have a dimension that allows the shaft member 23a to fit into the hole 24 without rattling and to rotate smoothly. Therefore, the shutter blade 20 rotates smoothly with respect to the drive arm 21a with the shaft member 23a as the rotation center.

  The shutter blade 20 is made of a laser light-absorbing resin having a light-shielding property, and is produced, for example, by stamping a sheet material made of PET (polyethylene terephthalate) containing a black paint or the like by pressing. Since the shutter blades 20 are made of resin, the weight can be reduced and it is effective for executing a high-speed shutter.

  Next, a method for joining the shutter blade 20 and the drive arm 21a will be described.

  First, the carbon layer 32 is formed on the base material 31 having a predetermined shape made of a thermoplastic resin, and the drive arm 21a is manufactured. Also, a laser light absorbing resin sheet material containing black paint or the like is punched into a predetermined shape by press working to produce a shutter blade 20 having a predetermined thickness.

  Next, the shaft member 23a made of a laser light transmitting resin is inserted into the hole 24 provided in the drive arm 21a, and the end portion 25a of the shaft member 23a is brought into contact with a predetermined position on the main surface of the shutter blade 20. Further, the shaft member 23a and the shutter blade 20 are fixed with a jig (not shown) in a state where the end portion 25a of the shaft member 23a and the main surface of the shutter blade 20 are in contact with each other. Thereafter, the shaft member 23a is irradiated with laser light for a predetermined time from above the shaft member 23a using a laser beam irradiation device (not shown). At this time, a mask 33 is disposed between the laser beam irradiation device and the shaft member 23 a, and the laser beam spot diameter of the laser beam in the contact area 34 between the shaft member 23 a and the shutter blade 20 is masked by the mask 33. Is masked to be smaller than the diameter of the shaft member 23a. The masked laser light passes through the shaft member 23a made of a laser light transmitting resin and reaches the contact region 34 between the shaft member 23a and the shutter blade 20. The laser light reaching the contact area 34 is absorbed by the contact area 34 of the shutter blade 20 made of a laser light absorbing resin. The laser light absorbed in the contact region 34 is accumulated as energy. As a result, the region on the shutter blade 20 side in the contact region 34 is heated and melted, and in the contact region 34 by heat transfer from the shutter blade 20. The region on the shaft member 23a side is melted by overheating. Thereafter, the contact area 34 heated and melted is cooled, so that the shaft member 23a and the shutter blade 20 are fused (joined) to each other.

  Since the shutter blade 20 contains black paint or the like, the shutter blade 20 can be melted by laser light emitted from the outside. On the other hand, since the drive arm 21a is a shutter mechanism component, it needs a light blocking function in function. However, since the carbon layer 32 having a thickness of about 7.0 μm is formed on the surface of the base material 31, the base material 31 is provided. Will not be deformed at a temperature of resin fusion. This is because the carbon layer 32 is a material having a higher melting point than the laser light absorbing resin and the laser light transmitting resin.

  That is, although the drive arm 21a whose surface is coated with the carbon layer 32 receives heat transfer from the contact region 34, the carbon particles on the surface of the carbon layer 32 do not melt at the temperature due to heat transfer and contact the contact region 34. Even if it does, the carbon layer 32 surface does not change. Therefore, even if the shaft member 23a is fused to the shutter blade 20 by the laser beam, the drive arm 21a is not affected by heat transfer and maintains a rotatable state with respect to the shaft member 23a.

  According to the present embodiment, the shaft member 23a is made of a laser light transmitting resin and the shutter blade 20 is made of a laser light absorbing resin, and the shaft member 23a and the shutter blade 20 are fused to each other by the laser light. The shaft member 23 a does not protrude from the back surface of the shutter blade 20 at the joint between the shaft member 23 a and the shutter blade 20. Further, since the shaft member 23a is made of a laser light transmitting resin, the moment of inertia is smaller than that of a shaft member made of metal or the like, and the operation time of the light quantity adjusting blade 20 is shortened. Therefore, by attaching the shutter blade 20 to the drive arm 21a without using a caulking pin, contact with an adjacent blade can be prevented and a high-speed shutter can be easily executed.

  In the present embodiment, polycarbonate is used as the laser light transmitting resin, and polyethylene terephthalate containing black paint is used as the laser light absorbing resin, but the laser light transmitting resin is made of a material mainly composed of polycarbonate, The laser light absorbing resin may be made of a material mainly composed of polyethylene terephthalate. Further, the material of the shaft member and the shutter blade may be a combination other than polycarbonate and polyethylene terephthalate. Specifically, the shaft member is a material selected from the group consisting of PC and ABS, and may be a material selected from the group consisting of PET, PC, and ABS.

  Moreover, in the said embodiment, although the carbon layer 32 is formed in the surface of the base material 31, it does not restrict to this. That is, a layer made of a material having a higher melting point than that of the base material 31, for example, a metal material, may be formed on the surface of the base material 31 by vapor deposition or painting. The drive arm 21a includes a base material 31 made of a thermoplastic resin and a carbon layer 32 formed on the surface of the base material 31. However, the present invention is not limited to this, and the entire drive arm 21a is made of a metal material. It may be made of a carbon material.

  In the present embodiment, the shaft member 23a is fused to the shutter blade 20 in a state of passing through the hole 24 of the drive arm 21a. However, the present invention is not limited to this. 23a may be fused to the drive arm 21a in a state of passing through the hole of the shutter blade 20. In this case, a coating layer made of a carbon material or the like is formed on the surface of the shutter blade 20.

  In the present embodiment, the drive arm 21a is rotationally driven by a drive source (not shown), but the present invention is not limited to this, and a link mechanism for converting the rotational motion of the drive source (not shown) into a linear motion is provided. The drive arm 21a may be configured to operate in parallel by the link mechanism.

  FIG. 4 is a partial cross-sectional view schematically showing the configuration of the light quantity adjustment blade according to the second embodiment of the present invention. In the first embodiment, the shaft member 23a is made of a laser light transmitting resin and the shutter blade 20 is made of a laser light absorbing resin. In the second embodiment, the shaft member is a laser light absorbing resin. The shutter blade is made of a laser light transmitting resin.

  In FIG. 4, a pair of drive arms 41a and 41b that are rotationally driven by a drive source (not shown), and a shutter blade 40 that is rotatably attached to the ends of the pair of drive arms 41a and 41b and regulates the opening amount. And a pair of shaft members 43a and 43b that pivotally support the shutter blade 40 on the pair of drive arms 41a and 41b. Note that the drive arm 41b and the shaft member 43b have the same configurations as the drive arm 41a and the shaft member 43a, respectively, and thus description thereof is omitted.

  The shaft member 43a is made of a laser light-absorbing resin having a light shielding property, and is made of, for example, PET (polyethylene terephthalate) containing black paint or the like. The shaft member 43a is a cylindrical shaft having a flange 44a at one end. The other end 45a of the shaft member 43a is fused to the main surface of the shutter blade 40 in a state of passing through a hole 44 of a drive arm 41a described later.

  The shutter blade 40 includes a base material 46 made of a laser light transmitting resin, for example, a natural grade of PC, and a carbon layer 47 formed on the surface of the base material 46. The carbon layer 47 is formed over the entire surface of the base member 46 except for the contact region 54 between the shaft member 43a and the shutter blade 40 and the region 55 located behind the contact region 54 with respect to the shutter blade 40. ing. The carbon material of the carbon layer 47 is a material having a higher melting point than the laser light absorbing resin and the laser light transmitting resin.

  The drive arm 41 a includes a base material 41 made of a thermoplastic resin such as PET, PC, ABS, and a carbon layer 42 formed on the surface of the base material 41. Further, a hole 44 is provided at the end of the drive arm 41a, and the shaft member 43a is formed to have a dimension that allows the shaft member 43a to fit smoothly and rotate smoothly.

  Next, a method for joining the shutter blade 40 and the drive arm 41a will be described.

  First, the carbon layer 42 is formed on the base 31 having a predetermined shape made of a thermoplastic resin, and the drive arm 41a is manufactured. The carbon material of the carbon layer 42 is a material having a higher melting point than the laser light absorbing resin and the laser light transmitting resin. Further, a base material 46 is produced by punching a sheet material made of a laser light transmitting resin into a predetermined shape by press working, and a contact region 54 between the shaft member 43 a and the shutter blade 40 and a contact region 54 with respect to the shutter blade 40. The carbon layer 47 is formed over the entire surface of the base material 46 except for the surface 55 located on the back side of the substrate. The carbon layer 47 may be formed by masking the contact area 54 between the shaft member 43a and the shutter blade 40, or after forming the carbon layer 47 over the entire surface of the base member 46, A portion corresponding to the contact area 54 and the area 55 may be polished by machining.

  Next, the shaft member 43a made of a laser light absorbing resin is inserted into the hole 44 provided in the drive arm 41a, and the end 45a of the shaft member 43a is placed at a predetermined position on the main surface of the shutter blade 40, that is, the carbon layer 47. It is made to contact | abut to the contact area | region 54 in which no is formed. Further, the shaft member 43a and the shutter blade 40 are fixed by a jig (not shown) in a state where the end portion 45a of the shaft member 43a and the contact region 54 of the shutter blade 40 are in contact with each other. Thereafter, the shaft member 43a is irradiated with laser light for a predetermined time from below the shutter blade 40 using a laser light irradiation device (not shown). At this time, a mask 53 is disposed between the laser beam irradiation apparatus and the shaft member 43 a, and the laser beam spot diameter of the laser beam in the contact region 54 between the shaft member 53 a and the shutter blade 40 is masked by the mask 53. Is masked to be less than the diameter of the shaft member 43a. The masked laser light passes through the laser light transmitting resin base 46 and reaches the contact area 54 between the shaft member 43 a and the shutter blade 40. The laser beam that has reached the contact region 54 is absorbed by the contact region 54 of the shaft member 43a made of a laser light absorbing resin. The laser light absorbed in the contact region 54 is accumulated as energy. As a result, the region on the shaft member 43a side in the contact region 54 is heated and melted, and in the contact region 54 by heat transfer from the shaft member 43a. The region on the shutter blade 40 side is melted by overheating. Thereafter, the contact area 54 heated and melted is cooled, so that the shaft member 43a and the shutter blade 40 are fused (joined) to each other.

  According to the present embodiment, the shaft member 43a is made of a laser light absorbing resin and the shutter blade 40 is made of a laser light transmitting resin, and the shaft member 43a and the shutter blade 40 are fused to each other by the laser light. The shaft member 43 a does not protrude from the back surface of the shutter blade 40 at the joint between the shaft member 43 a and the shutter blade 40. Further, since the shaft member 43a is made of a laser light absorbing resin, the moment of inertia is smaller than that of a shaft member made of metal or the like, and the operation time of the shutter blade 40 is shortened. Therefore, by attaching the shutter blade 20 to the drive arm 41a without using a caulking pin, contact with an adjacent shutter blade can be prevented and a high-speed shutter can be easily executed.

  Even when it is necessary to use a transparent material for the base material 46 of the shutter blade 40, the carbon layer 47 is formed over the entire surface of the base material 46, so that the light shielding property of the shutter blade 40 is sufficiently satisfied. be able to.

  In the above embodiment, the carbon layer 47 is formed on the surface of the substrate 46, but the present invention is not limited to this. That is, a layer made of a material having a higher melting point than the base material 46, for example, a metal material, may be formed on the surface of the base material 46 by vapor deposition or painting.

  FIG. 5 is an exploded perspective view showing a configuration of an iris diaphragm apparatus including a light quantity adjustment blade according to a third embodiment of the present invention, and FIG. 6 is a partial cross-sectional view showing a configuration of the light quantity adjustment blade in FIG. It is.

  5 and 6, the iris diaphragm device 60 includes a blade case 61 that supports a pair of light quantity adjustment blades, which will be described later, so as to be movable in the vertical direction, and an opening provided in the blade case 61. A pair of light amount adjusting blades 62a and 62b for restricting the opening amount of 61a and a thin plate-shaped ND filter 63 pivotally supported by the light amount adjusting blade 62a are provided. The iris diaphragm device 60 is provided on the inner surface of the blade case 61, and is provided on the shaft 64 that pivotally supports the ND filter 63 on the blade case 61 and the main surface of the light amount adjusting blade 62a. And a shaft member 65 that pivotally supports the blade 62a. Furthermore, the iris diaphragm device 60 includes an arm portion 66 that is disposed below the pair of light amount adjustment blades 62a and 62b and to which the lower ends of the pair of light amount adjustment blades 62a and 62b are connected.

  The pair of light quantity adjusting blades 62a and 62b is made of a laser-absorbing resin having a light-shielding property. Produced. The pair of light quantity adjusting blades 62a and 62b approach or separate from each other by the rotation of an arm portion 66 driven by a drive source (not shown) such as a motor.

  The ND filter 63 includes a base material 63a made of a transparent thermoplastic resin such as PET, PC, and ABS, a filter layer 63b that is formed by vapor deposition on one of the main surfaces of the base material 63a, and reduces the transmittance. On the other of the main surfaces of 63a, it has the carbon layer 63c formed in the peripheral part of the hole 63d mentioned later (Drawing 6). A hole 63d into which the shaft member 65 is inserted is provided at a substantially central portion of the ND filter 63, and the shaft member 65 is formed to have a dimension that allows the shaft member 65 to fit without shaking and to rotate smoothly. The ND filter 63 has a substantially concave engaging portion 63e that engages with a support member 64 provided on the blade case 61 and pivotally supports the ND filter 63 at the end of the base 63a. In other words, the ND filter 63 rotates around the support member 64 when the shaft member 65 inserted into the hole 63d moves in the vertical direction along with the movement of the light quantity adjustment blade 62a.

  The shaft member 65 is a cylindrical shaft having a flange 65a at one end. The other end portion 65b of the shaft member 65 is fused to the main surface of the light amount adjustment blade 62a in a state of passing through the hole 63d of the ND filter 63. The shaft member 65 is made of a laser light transmissive resin, and is molded from a natural grade of PC (polycarbonate) such as transparent or white (not filled with other particles such as carbon).

  FIGS. 7A and 7B are diagrams for explaining the operation of the light amount adjustment blade in FIG. 5. FIG. 7A shows a state before light amount adjustment, and FIG. 7B shows a state after light amount adjustment.

  First, when a light amount is necessary for photographing a dark part, the pair of light amount adjusting blades 62a and 62b are most separated from each other in order to open the opening 61a. At this time, the ND filter 63 is retracted from the opening 61a (FIG. 7A). Thereafter, when adjusting the amount of light, the drive source is driven based on a signal from a sensor (not shown) or the like, the arm 66 rotates in a predetermined direction, and the pair of light amount adjustment blades 62a and 62b approach each other. The opening area of the opening 61a is reduced. When the amount of light is further reduced, the ND filter 63 enters the opening 61a with the movement of the pair of light amount adjustment blades 62a after the opening 61a reaches a predetermined opening area. When the pair of light quantity adjustment blades 62a and 62b are closest to the opening 61a, the ND filter 63 covers all of the opening 61a (FIG. 7B).

  According to the present embodiment, the shaft member 65a is made of a laser light absorbing resin and the light amount adjusting blade 62a is made of a laser light transmitting resin, and the shaft member 65a and the light amount adjusting blade 62a are fused to each other by the laser light. Therefore, the shaft member 65a does not protrude from the back surface of the light amount adjusting blade 62a at the joint portion between the shaft member 65a and the light amount adjusting blade 62a. Further, since the shaft member 65a is made of a laser light absorbing resin, the moment of inertia is smaller than that of a shaft member made of metal or the like, and the operation time of the light quantity adjusting blade 62a is shortened. Therefore, contact with the adjacent light quantity adjusting blade 62b can be prevented and a high-speed shutter can be easily executed.

  Further, the ND filter 63 is pivotally supported by the light amount adjusting blade 62a, and rotates about the shaft member 64 when the light amount adjusting blade 62a moves in the vertical direction, so that a drive source dedicated to the ND filter 63 is not provided. The light quantity can be accurately adjusted with a simple configuration.

It is an external view which shows roughly the structure of the light quantity adjustment blade | wing which concerns on the 1st Embodiment of this invention. It is an external view which shows the structure of the light quantity adjustment blade | wing in FIG. It is sectional drawing of the junction part of the shutter blade | wing 20 and the drive arm 21a along line segment AA of FIG. It is a fragmentary sectional view which shows roughly the structure of the light quantity adjustment blade | wing which concerns on the 2nd Embodiment of this invention. It is a disassembled perspective view which shows the structure of an iris diaphragm apparatus provided with the light quantity adjustment blade | wing which concerns on the 3rd Embodiment of this invention. It is a fragmentary sectional view which shows the structure of the light quantity adjustment blade in FIG. It is a figure explaining operation | movement of the light quantity adjustment blade | wing in FIG. 5, (a) shows the state before light quantity adjustment, (b) shows the state after light quantity adjustment. It is a figure which shows an example of the conventional light quantity adjustment blade.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Focal plane shutter 13a, 13b A pair of shaft member 20 Shutter blade | wing 21a, 21b A pair of drive arm 23a Shaft member 24 Hole 24a Eave part 31 Base material 32 Carbon layer 34 Contact area | region

Claims (4)

A light amount adjusting member, a driving member in which a hole is formed, and a shaft member in which a flange having a diameter larger than the hole is formed at one end ,
The shaft member is formed by a laser light transmitting resin,
The light amount adjusting member is formed of a laser light absorbing resin ,
The surface of the drive member is covered with a material having higher melting point than the laser beam transmissive resin and the laser-absorbing resin,
The other end of the shaft member that has penetrated the hole is brought into contact with the light amount adjusting member,
By irradiating a laser beam having a spot diameter in a contact area between the shaft member and the light amount adjusting member smaller than the diameter of the shaft member from the flange side of the shaft member, the shaft member and the light amount adjustment. A light amount adjusting device characterized by fusing a member . A light amount adjusting member, a driving member in which a hole is formed, and a shaft member in which a flange having a diameter larger than the hole is formed at one end,
The shaft member is formed of a laser light absorbing resin,
The light amount adjusting member is formed of a laser light transmitting resin;
The other end of the shaft member that has penetrated the hole is brought into contact with the light amount adjusting member,
The surface of the light quantity adjusting member excluding the contact area with the shaft member and the portion located on the back side of the contact area is covered with a material having a higher melting point than the laser light transmitting resin and the laser light absorbing resin. I,
The surface of the driving member is covered with a material having a higher melting point than the laser light transmitting resin and the laser light absorbing resin,
Laser light having a spot diameter in a contact area between the shaft member and the light amount adjusting member smaller than the diameter of the shaft member is irradiated from a portion located behind the contact area between the light amount adjusting member and the shaft member. By doing so, the shaft member and the light amount adjusting member are fused together . A method of manufacturing a light amount adjusting device comprising: a light amount adjusting member; a driving member in which a hole is formed; and a shaft member in which a flange having a diameter larger than the hole is formed at one end;
The shaft member is formed of a laser light transmitting resin,
The light amount adjusting member is formed of a laser light absorbing resin,
Covering at least the surface of the drive member with a material having a higher melting point than the laser light transmitting resin and the laser light absorbing resin;
The other end of the shaft member that has penetrated the hole is brought into contact with the light amount adjusting member,
By irradiating a laser beam having a spot diameter in a contact area between the shaft member and the light amount adjusting member smaller than the diameter of the shaft member from the flange side of the shaft member, the shaft member and the light amount adjustment. A method of manufacturing a light amount adjusting device, characterized by fusing a member. A method of manufacturing a light amount adjusting device comprising: a light amount adjusting member; a driving member in which a hole is formed; and a shaft member in which a flange having a diameter larger than the hole is formed at one end;
The shaft member is formed of a laser light absorbing resin,
The light amount adjusting member is formed of a laser light transmitting resin,
The other end of the shaft member that has penetrated the hole is brought into contact with the light amount adjusting member,
The surface of the light amount adjusting member excluding the contact region with the shaft member and the portion located on the back side of the contact region is covered with a material having a higher melting point than the laser light transmitting resin and the laser light absorbing resin. ,
The driving member covers at least the surface thereof with a material having a higher melting point than the laser light transmitting resin and the laser light absorbing resin,
Laser light having a spot diameter in a contact area between the shaft member and the light amount adjusting member smaller than the diameter of the shaft member is irradiated from a portion located behind the contact area between the light amount adjusting member and the shaft member. By doing so, the shaft member and the light amount adjusting member are fused, and the method for manufacturing the light amount adjusting device is characterized.

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