JP5812644B2 - Optical device component fixing structure - Google Patents

Description

  The present invention relates to a technique for fixing each holding member by adjusting a relative position between an optical element and a light receiving element in an optical apparatus.

  2. Description of the Related Art Conventionally, there is known a member fixing structure for an optical device that adjusts the relative positions of a holding member that holds an optical element and a holding member that holds a light receiving element, and fixes them by filling and bonding.

  For example, a device that reads an optical image of an object using an optical element is mounted inside a camera, a facsimile, a scanner device, or the like, which is an optical device. In this apparatus, it is necessary to align the optical axis of the optical element and the optical axis of the light receiving element, and to keep the optical characteristics (focus, magnification) within the required accuracy. For this reason, a structure is generally adopted in which the holding members of the both are bonded and fixed in a state where the image forming position of the optical element and the relative position of the light receiving element are adjusted.

  There are roughly two structures for fixing with an adhesive as described above, one is a structure in which the adhesion portions of both holding members are in contact with each other, and the other is a structure in which there is a gap in the adhesion portion. . The former is called a close adhesion structure, and the latter is called a filling adhesion structure.

  In the former adhesion bonding structure, since it is necessary to provide a large number of movable parts in the adjustment mechanism, there are disadvantages that the number of bonding points increases and the positional deviation due to bonding increases. In the latter filling and bonding structure, it is difficult to set a gap between bonding points. When the gap is wide, there is a problem that the adhesive is drooped or hardened due to leakage, and when the gap is narrowed, the adjustment allowance cannot be secured and the adhesive does not flow.

  The following Patent Document 1 discloses a filling adhesion structure for solving the above problem. Specifically, the first work is provided with a protrusion, and the second work is provided with a hole that loosely engages with the protrusion, and the relative position of the two is set between the protrusion and the hole. An annular body that can be adjusted and also functions as an adhesive leakage prevention means is interposed. After the position adjustment, the adhesive and adhesive can be easily applied and cured without causing the adhesive to leak from the gap by adhering the protrusion and the hole together with the annular body.

  Also, unlike the tight adhesion structure, the filling adhesion structure does not contact each other and there is a gap, so adjustment is possible in any three-dimensional direction, and the center of the optical element and the light receiving element can be adjusted with one adjustment. The position and focus direction can be adjusted.

  On the other hand, in recent years, photometry devices that control camera exposure not only measure the brightness of the field, but also detect the position of the subject (for example, a person or a car) based on the luminance information of the field. In addition, functions for assisting focus detection and scene recognition are known. In this photometric device, a predetermined required accuracy is also required in the focus direction, and it is necessary to strictly adjust the relative position between the photometric optical element and the photometric light receiving element. In particular, in a photometric device for a single-lens reflex camera that is required to be downsized, that is, to save space, the above-described close-contact adhesive structure requires a complicated mechanical configuration and space, and thus a filling adhesive structure is suitable.

Japanese Patent No. 3434103

  However, there are some disadvantages in adopting the filling and bonding structure in an apparatus that requires downsizing such as a photometric device of a camera.

  For example, in general, the light receiving element is mounted on a flexible printed circuit board for transferring the obtained electrical signal to a signal processing circuit (not shown). In such a configuration, the printed circuit board is enlarged by a large number of signal lines, so that the tensile force from the printed circuit board is larger than the weight of the light receiving element fixing member. Then, the position of the light receiving element fixing member cannot be uniquely determined, and it is necessary to adjust the gripping position at the time of starting the position adjustment to the current position of the light receiving element holding member every time. That is, when the position adjustment for fixing is performed, the light receiving element holding member cannot be gripped at a fixed position, so that the position adjustment is difficult.

  In addition, when a sufficient gap is not provided between the locations where the light receiving element and the optical element are bonded, the light receiving element holding member contacts the optical element due to variations in the position before the adjustment of the light receiving element holding member. There was also a risk of damage to the optical element due to contact and interference.

  The present invention has been made in order to solve the above-described problems of the prior art. The purpose of the present invention is to make it possible to hold the second holding member at a fixed position when adjusting the position for fixing. It is to make it easy to perform and to prevent damage to the optical element.

To achieve the above object, according to the present invention, the relative position of the second holding member that holds the light receiving element that receives light from the optical element is adjusted with respect to the first holding member that holds the optical element. In this state, the second holding member is a member fixing structure of an optical device that is fixed to the first holding member, and the engaging portion provided in the first holding member, and the engagement An engaged portion provided in the second holding member corresponding to the portion, a fixing portion provided in the first holding member, and provided in the second holding member corresponding to the fixing portion When the first holding member and the second holding member are in a predetermined positional relationship in which the relative position of the second holding member with respect to the first holding member can be adjusted, anda fixed portion which can be fixed Te, and the engaging portion and the engaged portion It becomes temporary holding state where the by engaging the second holding member is temporarily positioned relatively definite position with respect to the first holding member and the second holding member is the first In order to be fixed to the holding member, when the second holding member is displaced from the temporary holding state relative to the first holding member until the predetermined positional relationship is reached , The engagement with the engaged portion is configured to be released.

  According to the present invention, when the position adjustment for fixing is performed, the second holding member can be gripped at a fixed position, thereby facilitating the position adjustment and preventing the optical element from being damaged.

It is typical sectional drawing which shows an example of the optical device with which the member fixing structure which concerns on one embodiment of this invention is applied. It is a disassembled perspective view of a photometry unit. It is a perspective view of a photometry unit, and sectional drawing of the photometry unit along the AA line of FIG. It is a perspective view of the 2nd holding member holding the photometry sensor, and sectional drawing of the photometry unit in alignment with the BB line of Drawing 2 in the temporary holding state of the 2nd holding member. It is a perspective view which shows the state which has hold | gripped the 2nd holding member with the adjustment tool. Sectional drawing which shows the state in which the 2nd holding member is hold | gripped and the main positioning is made, Typical sectional drawing which shows 1 set of projection parts and a fitting hole, Z axis which shows the modification of a temporary holding mechanism It is the schematic diagram seen from the direction. It is a perspective view of the 2nd holding member which has the temporary holding mechanism of the modification, and sectional drawing of the photometry unit in alignment with the BB line of Drawing 2 in the temporary holding state of the 2nd holding member.

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

  FIG. 1 is a schematic cross-sectional view showing an example of an optical apparatus to which a member fixing structure according to an embodiment of the present invention is applied. Although a single-lens reflex camera is taken as an example of the optical device, it is not limited to this.

  This camera includes a camera body 1 and a photographing lens 2. The photographic lens 2 is shown as two lenses for convenience, but actually includes a larger number of lenses. The camera body 1 has various parts necessary for photographing such as a shutter 4 and an image sensor 5. In the camera body 1, first, a main mirror 3 that is obliquely provided or retracted in the photographing optical path is provided according to the observation state and the photographing state. The image sensor 5 is a CCD or CMOS type image sensor disposed as a photosensitive member, but may be a silver salt film.

  A focusing screen 6 is disposed on the planned imaging surface of the photographic lens 2, and the photographic light from the photographic lens 2 is reflected by the main mirror 3 and is primarily imaged on the focusing screen 6. Also, a pentaprism 7 for changing the finder optical path is provided. The photographer can view the object scene image through the pentaprism 7 and the eyepiece lens 8, and has a so-called TTL type optical viewfinder configuration.

  In addition, photometric lenses 9a and 9b, which are optical elements for photometry, are provided. The photometric lenses 9 a and 9 b form a secondary image of the image primarily formed on the focusing screen 6 on the photometric sensor 10 that is a light receiving element for photometry via the pentaprism 7. In the present embodiment, the photometric lenses 9a and 9b are composed of two lenses, and an image primarily formed on the focusing screen 6 is optically converted upward by the photometric lens 9a and connected to the photometric sensor 10 by the photometric lens 9b. This is a photometric optical system for imaging. As a result, the mechanical structure around the photometric optical system can be reduced in size.

  The photometric sensor 10 is a light receiving element such as a CCD or a CMOS, for example, and detects the field brightness and the position of the subject from the information of the image formed by the photometric lenses 9a and 9b. Control, focus detection assistance, and the like are performed. A configuration including the photometric lenses 9a and 9b and the photometric sensor 10 and a holding member for holding them constitutes a photometric unit.

  FIG. 2 is an exploded perspective view of the photometric unit. FIG. 3A is a perspective view of the photometric unit, and FIG. 3B is a cross-sectional view of the photometric unit along the line AA in FIG.

  As shown in FIGS. 2 and 3B, the optical axis of the photometric lenses 9a and 9b is C1, and the optical axis of the photometric sensor 10 is C2. The photometric lenses 9 a and 9 b are held by the first holding member 11. The photometric sensor 10 is held by the second holding member 12. The second holding member 12 has a pair of projecting grip portions 17 that are gripped at the time of positioning and bonded to the first holding member 11. The protruding grip 17 has a symmetrical shape with the optical axis C2 of the photometric sensor 10 as the center.

  As shown in FIG. 2, the axis in the direction along the optical axes C1 and C2 is taken as the z-axis. An axis that is perpendicular to the z-axis and connects the two protruding grips 17 of the second holding member 12 across the optical axis C2 is defined as an x-axis. An axis in a direction perpendicular to the z axis and perpendicular to the x axis is taken as a y axis. The rotational directions around the x-axis, y-axis, and z-axis are θx, θy, and θz, respectively.

  As shown in FIGS. 2 and 3, the second holding member 12 is stacked on the first holding member 11 along the z-axis, and both are filled and fixed with an adhesive 13. In the state of being bonded and fixed, the optical axes C1 and C2 are parallel to the z axis and coincide with each other. Relative provisional positioning and main positioning of the first holding member 11 and the second holding member 12 are performed before the filling and adhesion fixing.

  Here, “main positioning” refers to positioning the second holding member 12 at an appropriate position for filling and fixing to the first holding member 11. “Temporary positioning” means that the second holding member 12 is temporarily held with respect to the first holding member 11 at a certain position suitable for gripping in the pre-positioning stage. These positioning modes will be described in detail later.

  The photometric lenses 9a and 9b are positioned and bonded and fixed to the first holding member 11 by positioning holes and outer diameter fittings. The first holding member 11 to which the photometric lenses 9a and 9b are bonded is fixed to a not-shown pentaprism holding member or the like. Further, the first holding member 11 is formed with an arc-shaped rib 11b projecting from the second holding member 12 along the z-axis. A portion of the second holding member 12 near the root of each protruding grip 17 and far from the optical axis C2 serves as an adhesive portion 17a (FIGS. 2 and 3B). The adhesive portions 17a of the two protruding grip portions 17 are locations to be bonded to the corresponding ribs 11b. The photometric sensor 10 is bonded and fixed to the second holding member 12 to form an integral unit.

  FIG. 4A is a perspective view of the second holding member 12 that holds the photometric sensor 10. FIG. 4B is a cross-sectional view of the photometry unit along the line BB in FIG. 2 in the temporary holding state of the second holding member 12.

  The second holding member 12 is formed in a generally plate shape with resin or the like. A surface of the second holding member 12 that faces the first holding member 11 is referred to as a facing surface 12b. On the other hand, the surface of the first holding member 11 that faces the facing surface 12b of the second holding member 12 is defined as a facing surface 11c.

  A plurality (four) of protrusions (engagement portions) 11a are formed to protrude on the facing surface 11c of the first holding member 11 (FIGS. 2, 3B, and 4B). . On the other hand, the opposing surface 12b of the second holding member 12 is formed with a fitting hole (engaged portion) 12a, which is a blind hole fitting to the protruding portion 11a, corresponding to the protruding portion 11a. (FIG. 3 (b), FIG. 4 (a), (b)).

  Next, operations and modes for adjusting the relative positions of the photometric lenses 9a and 9b and the photometric sensor 10 will be described with reference to FIGS.

  FIG. 5 is a perspective view showing a state where the second holding member 12 is gripped by the adjustment tool. FIG. 6A is a cross-sectional view showing a state in which the second holding member 12 is being gripped and is being fully positioned. When positioning the second holding member 12 provided with the photometric sensor 10 with respect to the first holding member 11 provided with the photometric lenses 9a and 9b, the second holding member 12 is an adjustment tool. Grasped. As shown in FIG. 5, the adjustment tool has a pair of clamp portions 14. The clamp portion 14 holds the second holding member 12 by setting the opposing sides of the pair of protruding grip portions 17 as grip positions and moving both clamp portions 14 away from each other in the direction of the arrow in FIG.

  By the way, the photometric sensor 10 is mounted by soldering or the like on a flexible printed board for transferring an electric signal obtained by the photometric sensor 10 to a signal processing circuit (not shown). Before the position of the second holding member 12 is adjusted with respect to the first holding member 11, the second holding member 12 is connected to the signal processing circuit (not shown).

  At that time, as shown in FIG. 2, the second holding member 12 receives a tensile force in the direction of the arrow from the flexible printed circuit board. Therefore, until the second holding member 12 is gripped by the adjustment tool, the position and posture of the second holding member 12 are not uniquely determined by the tensile force. Therefore, the position of the clamp portion 14 of the adjustment tool must be changed in accordance with the current position of the second holding member 12 every time it is gripped by the adjustment tool. Further, since the position of the second holding member 12 at the time of mounting varies, the second holding member 12 comes into contact with and interferes with the photometric lens 9b held by the first holding member 11, and the photometric lens. There is also a risk of scratching 9b. Therefore, in the present embodiment, the second holding member 12 is temporarily positioned before the main positioning.

  In the temporary positioning, first, the second holding member 12 is placed on the first holding member 11, and at this time, the protrusion 11 a of the first holding member 11 is fitted to the second holding member 12. It is inserted and fitted into the hole 12a. When the protrusion 11a is inserted into the fitting hole 12a, it engages in a light press-fit state. Due to the fitting relationship at these four locations, a temporary holding state is established in which the position of the second holding member 12 is determined with respect to the first holding member 11 on six axes. In the temporary holding state, the second holding member 12 does not move even when receiving the tensile force from the flexible printed board.

  When the second holding member 12 enters the temporary holding state, the protruding gripping portion 17 is gripped by the pair of clamp portions 14 of the adjustment tool. Then, the second holding member 12 is moved to an appropriate region for filling and fixing, and accurate position adjustment (main positioning) is performed (FIG. 6A). That is, while reading the electrical signal of the photometric sensor 10, the optical axes C1 of the photometric lenses 9a and 9b and the optical axis C2 of the photometric sensor 10 are aligned so that the optical performance such as focus and magnification falls within a predetermined required accuracy. To. At this time, the second holding member 12 is adjusted by being displaced with respect to the six axes of x-axis, y-axis, z-axis, θx, θy, and θz.

  When the position adjustment in the main positioning is completed, a light (ultraviolet) curable adhesive or the like is bonded between the rib 11b of the first holding member 11 and the bonding portion 17a of the protruding holding portion 17 of the second holding member 12. The agent 13 is filled and adhesive fixing is performed (FIG. 3B). When the position adjustment and the adhesive fixing are completed, the gripping by the clamp unit 14 is released. Note that the adhesive 13 may be applied before the position adjustment, and then the position may be adjusted to cure the adhesive. The kind of adhesive 13 is not ask | required.

  Here, the positional relationship between the temporary holding state and the final positioning state will be described. FIG. 6B is a schematic cross-sectional view showing a set of protrusions 11a and fitting holes 12a. One set is shown as a representative, but the relationship is the same in the other sets.

  An adjustment range e illustrated in FIG. 6A indicates a range that the second holding member 12 can take in the direction of the optical axis C1 (z axis) as an appropriate position in the main positioning. In FIG. 6A, it is expressed by the position of the bottom surface of the fitting hole 12a, but when expressed by the position of the facing surface 12b, it is as shown in FIG. 6B. The adjustment range e is the range assumed as the position after filling and fixing, and is specifically calculated from the amount of variation due to the accumulation of tolerances of mechanical parts and optical parts. is there. The adjustment range e is defined by a region in the z direction that includes variations in θx and θy, but is actually set in consideration of variations in all six axes.

  6B, in the adjustment range e, the tip position 11a1 of the protrusion 11a is a distance D (D>) from the facing surface 12b with respect to the position where the fitting hole 12a is closest to the protrusion 11a. A gap is secured only by 0). Therefore, in the fully positioned state, the protrusion 11a is not even inserted into the fitting hole 12a. In other words, the tip position 11a1 of the protrusion 11a is not allowed to be positioned within the adjustment range e, and is positioned at least a distance D from the adjustment range e, that is, near the outside of the adjustment range e. Further, it is assumed that no other member that interferes with the second holding member 12 is disposed within the adjustment range e around the second holding member 12.

  Accordingly, when the main positioning is performed, the second holding member 12 can be freely displaced in all six axial directions with respect to the first holding member 11 within the adjustment range e. On the other hand, in the temporary positioning state, the position and posture of the second holding member 12 are fixed and always constant, so that gripping at the start of position adjustment is easy. In addition, since the position in the temporary holding state is fixed, the second holding member 12 is prevented from inadvertently interfering with the photometric lens 9b held in the first holding member 11 when temporarily holding. The

  Further, after gripping the second holding member 12 from the temporary holding state, if the second holding member 12 is displaced in the direction away from the first holding member 11 along the optical axis C1 (z axis), Since the engagement between the protrusion 11a and the fitting hole 12a is automatically released, no special operation is required.

  That is, even if the fitting hole 12a and the protruding portion 11a are lightly press-fitted and the tensile force of the flexible printed circuit board is received before the start of the positioning, the position of the second holding member 12 in the temporary holding state is There is no variation. Then, after the second holding member 12 is gripped by the adjusting tool, the protruding portion 11a is extracted from the fitting hole 12a, and thereafter, the second holding member 12 and the protruding portion 11a do not interfere with each other. As a result, the position of the second holding member 12 is adjusted smoothly.

  According to the present embodiment, the second holding member 12 engages with the fitting hole 12 a of the second holding member 12 and the protrusion 11 a of the first holding member 11, so that the second holding member 12 becomes the first holding member 11. Is temporarily held with respect to the position. When the second holding member 12 is displaced from the temporary holding state to a position within the range in which the relative position of the second holding member 12 with respect to the first holding member 11 is adjusted, the fitting hole 12a and the protruding portion The engagement with 11a is released. Thereby, when adjusting the position for fixing, the second holding member 12 can be held at a fixed position, so that the position can be easily adjusted and the photometric lens 9b can be prevented from being damaged.

  In the present embodiment, as a temporary holding mechanism for temporarily holding the second holding member 12 to the first holding member 11, the protruding portion 11a and the fitting hole 12a, that is, one is a convex portion and the other is a concave portion. The combination of was illustrated. However, the present invention is not limited to this, and the concavo-convex relationship between the two may be reversed.

  Moreover, as shown in FIG.6 (c) and FIG. 7, you may employ | adopt the modification of the combination of an engaging part and an engaged part. FIG. 6C is a schematic view seen from the z-axis direction showing a modification of the temporary holding mechanism. In this example, in the plane parallel to the x-axis and the y-axis, the first holding member 11 is provided with a protrusion 18 protruding in both directions along the y-axis, and the second holding member 12 has a protrusion. A bowl-shaped recess 19 corresponding to 18 is provided. When the protrusion 18 and the hook-shaped recess 19 are engaged, the second holding member 12 is constrained in the x-axis and y-axis directions with respect to the first holding member 11 and is in a temporary holding state. However, since it can be displaced away in the z-axis direction, if the second holding member 12 is displaced to the position of the adjustment range e (FIG. 6B), the relationship between the protrusion 18 and the bowl-shaped recess 19 is obtained. The match is released. The relationship between the protrusion 18 and the bowl-shaped recess 19 may be reversed.

  FIG. 7A is a perspective view of the second holding member 12 having a temporary holding mechanism of a modification, and FIG. 7B is a cross-sectional view of FIG. 2 in the temporary holding state of the second holding member 12. It is sectional drawing of the photometry unit in alignment with a line.

  In this modification, a U-shaped member 15 is provided on the second holding member 12. The U-shaped member 15 is attached and integrated so as to sandwich the second holding member 12. Instead of eliminating the fitting hole 12 a in the example shown in FIG. 4, a notch 15 a is formed on the side of the U-shaped member 15 facing the first holding member 11.

  When the notch 15a is engaged with the protrusion 18, the second holding member 12 is constrained in the x-axis and y-axis directions with respect to the first holding member 11 and enters a temporary holding state (FIG. 7B). )). However, since it can be displaced in the z-axis direction, if the second holding member 12 is displaced to the position of the adjustment range e (FIG. 6B), the engagement between the protrusion 18 and the notch 15a. Is released.

  From the viewpoint that the temporary holding mechanism is disengaged when the second holding member 12 is displaced with respect to the first holding member 11 from the temporary holding state, the second holding member 12 is displaced. The direction is not limited to the optical axis C1 (z axis) direction. For example, it may be an oblique direction including components in the x-axis and y-axis directions, and may include displacements in the rotation directions θx, θy, and θz.

  From the viewpoint of enabling gripping of the second holding member 12 at a fixed position when adjusting the position for fixing, the fixing between the second holding member 12 and the first holding member 11 is a filling adhesion. It is not limited to fixing.

  As an optical apparatus to which the member fixing structure of the present invention is applied, a facsimile, a scanner device, etc. can be considered in addition to a camera. The present invention is widely applicable to devices that fix the holding members by adjusting the relative positions of the optical element and the light receiving element.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

9a, 9b Photometric lens 10 Photometric sensor 10a Light receiving surface 11 First holding member 11a Protruding part 12 Second holding member 12a Fitting hole C1 Optical axis e Adjustment range

Claims (4)

In a state where the relative position of the second holding member that holds the light receiving element that receives light from the optical element is adjusted with respect to the first holding member that holds the optical element, the second holding member Is a member fixing structure of an optical device fixed to the first holding member,
An engaging portion provided on the first holding member;
An engaged portion provided in the second holding member corresponding to the engaging portion ;
A fixing portion provided on the first holding member;
The first holding member is provided in the second holding member corresponding to the fixing portion, and has a predetermined positional relationship in which a relative position of the second holding member with respect to the first holding member is adjustable. A fixed portion that can be fixed to the fixing portion when the second holding member is present ,
When the engaging portion and the engaged portion are engaged, the second holding member is temporarily held at a position relatively fixed with respect to the first holding member.
In addition, since the second holding member is fixed to the first holding member, the second holding member is moved relative to the first holding member from the temporary holding state . A member fixing structure for an optical apparatus , wherein the engaging portion and the engaged portion are disengaged when displaced to a positional relationship . When the first holding member pair to relative said second holding member is displaced until the predetermined positional relationship, said second holding member, wherein the temporary holding state, the optical element The engagement between the engaging portion and the engaged portion is released by displacing in a direction away from the first holding member along the direction of the optical axis. Optical device component fixing structure.   3. The member fixing structure for an optical apparatus according to claim 2, wherein one of the engaging portion and the engaged portion is a convex portion and the other is a concave portion. Optical according to any one of claims 1 to 3, wherein the said and the fixed portion of the first holding member fixed with the fixed portion of the second holding member are filled bonded Device fixing structure.

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