JPH1177763A - Optical image forming element injection molding die and its assembly method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical image forming element injection molding die for forming a high quality image forming element, and an assembly method thereof. SOLUTION: In an assembly method for an optical image forming element injection molding die, shifts of optical axes ϕ1 and ϕ2 of mirror blocks 1 and 2 of an incidence side lens and an image formation side lens is measured by optical axis measurement devices 6 and 7, and the inclination angle of a prism mirror face block 3 is measured by a block inclination measurement device 8. The positions of the mirror face blocks 1 and 2 of the incidence side lens and the image formation side lens are adjusted by adjusting bolts B11-B13 and B21-B23 so provided on the side face of a mold base 4 as to carry the optical axis shift amount Δϕ1 . and Δϕ2 smaller, and also the position of the prism mirror face block 3 is adjusted by an adjusting bolt B31 so provided on the bottom of a mold base 5 as to made the block inclination amount Δϕ3 smaller.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for injection molding of an optical imaging element and a method of assembling the same, and more particularly, to a structure of a plastic optical element such as a mold for injection molding such as a lens or a mirror prism. TECHNICAL FIELD The present invention relates to an assembling method, and relates to a structure and an assembling method of an injection molding die applicable to a general injection-molded product die.

[0002]

2. Description of the Related Art FIG. 6 is a perspective view for explaining an example of an optical imaging device. In the drawing, 11, 11 _n and 11 _{n + 1} are incident-side lenses, and 12, 12 _n and 12 _{n + 1.} Is an imaging side lens, 13 is a roof prism, and X is an arrangement direction.

[0003] The example shown in FIG.
This is an optical imaging element in which a roof prism lens including an imaging side lens 12 and a roof prism 13 having a ridge line formed by planes forming 90 ° from each other is arranged in an array in the X direction.

FIGS. 7A and 7B are diagrams for explaining a lens position shift of the optical image forming element shown in FIG. 6 and a shift of an image forming position due to a fall of the prism. FIG. 7A shows a position shift of the incident side lens, and FIG. 6, the position shift of the side lens, c is the position shift of the image, θ ₁ is the tilt angle of the optical axis on the image side, θ ₂ is the tilt angle of the prism, and other portions that have the same effect as the example shown in FIG. , The same reference numerals as in the example shown in FIG.

In the example shown in FIG. 7A, an n-th incident side lens 11 _n and an imaging side lens 12 _n and an (n + 1) th entrance side lens 11 _{n + 1} and an imaging side lens 12 _{n + 1} are used. This figure shows the shift of the image forming position when the position is shifted, and a combination of the position shift a of the incident side lens and the position shift b of the image side lens is generated as a shift c of the image forming position. ing.

[0006] example shown in FIG. 7 (B), shows the deviation c of the imaging position by the prism inclination (angle theta _2), the fall prism (angle theta _2), falls down the imaging side optical axis (Angle θ ₁ ), which results in a displacement c of the imaging position.

[0007]

As described above, in each of the roof prism lenses of the optical imaging elements arranged in an array, if the lens position or the prism angle shift occurs, the n-th and n + 1-th are set. Because the imaging position of
The combination causes an image shift, which has an adverse effect on optical characteristics (reduction in resolution). In order to produce a plastic lens optical element having a plurality of lenses or prisms, a mirror surface piece corresponding to a lens or a prism to be assembled into a mold is required to be high in order to affect the optical characteristics due to positional deviation and angular deviation of several μm and several seconds. One of the issues is to assemble it with precision.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and provides an injection mold for an optical imaging element for forming a high-quality optical imaging element and a method for assembling the same. It was made for the purpose of.

[0009]

According to a first aspect of the present invention, there is provided an incident side lens located on the incident side, and formed optically equivalent to the incident side lens and orthogonal to the optical axis of the incident side lens. An imaging side lens having an optical axis to be positioned on the imaging side,
A roof prism having a ridgeline disposed so as not to be orthogonal to any of the optical axes of the incident and imaging lenses in a plane formed by the optical axes of these lenses between the incident and imaging lenses. An optical imaging element injection molding mold for forming an optical imaging element comprising: a mirror piece for an incident side lens for forming the incident side lens; and an optical element for forming the imaging side lens. In the method of assembling an injection mold for an optical imaging element having a mirror piece for an imaging side lens and a mirror piece for a roof prism for forming the roof prism, the mirror piece for an entrance side and an imaging side lens is provided. And measuring the positional deviation between the optical axis with respect to each lens forming surface and each optical axis with respect to the prism forming portion of the mirror prism for the roof prism, and measuring the angular deviation with respect to each optical axis with respect to each of the deviation amounts. With a correction amount to and correcting adjusting the position of the respective optical insert is obtained by allowing the assembly of high-precision optical insert.

According to a second aspect of the present invention, in the first aspect of the invention, the measured position shift and angle shift are comprehensively calculated, and the position of each mirror surface piece is corrected with a correction amount corresponding to the calculated total shift amount. It is characterized by correcting and adjusting
Further, the mirror piece can be assembled with high precision.

A third aspect of the present invention is characterized in that, in the first or second aspect of the present invention, the correction and adjustment of the position of each mirror surface piece is processing on a mounting reference surface of each mirror surface piece, and furthermore, a high precision The mirror piece can be assembled.

According to a fourth aspect of the present invention, there is provided an incident-side lens located on the incident side, and an optical axis formed optically equivalent to the incident-side lens and orthogonal to the optical axis of the incident-side lens. Between the image-forming lens located on the image-forming side and the optical axis of these lenses between the light-entering and image-forming lenses and not orthogonal to any of the optical axes of the light-entering and image-forming lenses. Mold for forming an optical imaging element comprising a roof prism having a ridgeline arranged as described above, and a mirror surface for an entrance-side lens for forming the entrance-side lens A mirror, a mirror surface piece for the imaging side lens for forming the imaging side lens, a mirror surface piece for the roof prism for forming the roof prism, and a mold base for these mirror surface pieces. In image element injection molding dies A wedge for adjusting the position of each mirror surface piece with respect to the mold base is provided between the mold base and each mirror surface piece, so that a highly accurate mirror surface piece can be assembled. is there.

According to a fifth aspect of the present invention, there is provided an incident-side lens located on the incident side, and an optical axis formed optically equivalent to the incident-side lens and orthogonal to the optical axis of the incident-side lens. Between the image-forming lens located on the image-forming side and the optical axis of these lenses between the light-entering and image-forming lenses and not orthogonal to any of the optical axes of the light-entering and image-forming lenses. Mold for forming an optical imaging element comprising a roof prism having a ridgeline arranged as described above, and a mirror surface for an entrance-side lens for forming the entrance-side lens A mirror, a mirror surface piece for the imaging side lens for forming the imaging side lens, a mirror surface piece for the roof prism for forming the roof prism, and a mold base for these mirror surface pieces. In image element injection molding dies Characterized by having an adjusting bolt for adjusting the position of the respective optical insert relative to the mold base over scan is obtained by allowing the assembly of high-precision optical insert.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view for explaining an example of a mirror piece of an optical element mold and a mold base to which the present invention is applied. , 1a
Is a mirror surface portion, 2 is a mirror surface piece for the imaging side lens, 2a is a mirror surface portion,
4 is a mold base.

FIG. 2 is a schematic view of an essential part for explaining an embodiment of an injection mold for an optical imaging element according to the present invention and a method of assembling the same. In FIG.
Is a mold base, 6 and 7 are optical axis measuring devices, 8 is a piece falling measuring device, and B11, B12, B13, B21, B22, and B3.
1 is an adjustment bolt, Y ₁ and Y ₂ are adjustment directions, φ ₁ , φ ₂ , φ
Reference numeral ₃ denotes an optical axis, Δφ ₁ and Δφ ₂ denote optical axis deviation amounts, Δφ ₃ denotes a piece falling amount, and other portions having the same operation as the example shown in FIG. It is attached.

In the example shown in FIG. 2A, the optical axes φ ₁ , φ with respect to the mirror surfaces 1 a, 2 a of the mirrors 1, 2 for the entrance lens and the imaging lens are measured by the optical axis measuring devices 6, 7. ₂ are measured, and adjustment bolts B11 to B11 provided on the side surface of the mold base 4 are set so that the optical axis shift amounts Δφ ₁ and Δφ ₂ are reduced.
B13, B21 to B23 are used to adjust the positions of the entrance side lens and the mirror side pieces 1 and 2 for the imaging side lens.

[0017] Here, the optical insert 1 for incident-side lens in adjusting bolt B11, B12 pushing in the direction of Y _2, the optical insert 1 for incident-side lens in adjusting bolt B13 to pull in the Y ₁ direction adjust. Similarly, adjustment bolt B2
1, B22 in the imaging-side lens optical insert 2 pushed into Y ₁ direction, by adjusting bolts B23, adjusted to pull the imaging side lens optical insert 2 in the Y ₂ direction.

In the example shown in FIG. 2B, the falling angle of the prism mirror piece 3 is measured by the piece falling measuring device 8, and the mold base 5 is moved so that the falling amount Δφ _{3 of the} piece becomes small.
The position of the mirror surface piece for prism 3 is adjusted by an adjustment bolt B31 provided on the bottom surface of the prism.

According to the first aspect of the present invention, as shown in FIG.
Adjustment bolts B11 to B13, B21 to B23, B31
Thus, the mirror pieces 1 and 2 for the entrance side and the imaging side, and
The position of the prism mirror piece 3 is adjusted so as to reduce the deviation of the optical axis of each of the mirror pieces 1, 2, and 3 and the falling of the pieces, thereby assembling the mirror piece with high precision. High quality molded products can be obtained.

As described above, the deviation of the imaging position of the molded product is caused by the positional deviation of the mirror pieces 1 and 2 for the lens on the incident side and the imaging side and the angular deviation of the mirror piece 3 for the prism. On the other hand, the invention of claim 1 is a method of adjusting the mirror-side pieces 1, 2 for the lens on the incident side and the image-forming side and the mirror-side piece 3 for the prism independently. However, since the mirror pieces 1, 2 are adjacent to each other, only a small amount of adjustment can be performed. When the processing accuracy of the mirror pieces 1, 2, 3 is poor, the adjustment amount is too large to be adjusted and assembled. There is.

According to a second aspect of the present invention, the image formation position is predicted from the measurement results of the position and angle deviations of the mirror pieces 1, 2 for the lens on the incident side and the image formation side and the mirror piece 3 for the prism. By correcting the position of one of the three mirror pieces, the deviation of the imaging position is reduced. In this case, the position of only the prism mirror piece 3 may be adjusted, or the adjacent mirror mirror pieces 1 and 2 for the incident side and the imaging side may be simultaneously moved and adjusted in the same direction.

FIG. 3 is a view showing a main part of a mold for injection molding of an optical imaging element according to another embodiment of the present invention and a method of assembling the same, wherein 4a is a reference plane, 9 is a spacer. 10 and 10 are wedge blocks, B4 is a fixing bolt, d is a cutting width, and other portions having the same operation as the embodiment shown in FIGS. 1 and 2 are the same as the embodiment shown in FIGS. The same reference numerals are given.

In the embodiment shown in FIG. 3A, the mirrors 1 and 2 for the entrance side lens and the imaging side lens are moved to the left side in the drawing, and the mirrors 6 The optical axes of the mold bases 4 are measured by a width (cutting width d) corresponding to the positional deviation amount based on the measurement results.
It is the one that was excised.

In the embodiment shown in FIG. 3 (B), the spacer 9 is inserted by a width corresponding to the above-mentioned displacement amount, and the mirror-side pieces 1 and 2 for the lens on the incident side and the image forming side are fixed by the fixing bolt B4. It is fixed.

The embodiment shown in FIG. 3C is similar to the embodiment shown in FIG.
A wedge block 10 is provided in place of the fixing bolt B4 of the embodiment shown in FIG. 10. By using these fixing bolt B4 and the wedge block 10, the displacement of the mirror surface piece due to the resin pressure during molding can be reduced. Can be.

According to a third aspect of the present invention, as shown in FIG.
After measuring the positional deviation of each mirror piece, the mounting reference surface 4a of the mirror piece is adjusted by, for example, padding, inserting a spacer, etc., by the correction amount of the position of each mirror piece, and the mirror piece is assembled to the mold base. It was made.

FIG. 4 is a view showing the construction of a main part for explaining another embodiment of the mold for injection molding of an optical imaging element according to the present invention and a method of assembling the same. In FIG.
Numeral 5 denotes a fixing bolt, and the other portions having the same functions as those in the embodiment shown in FIGS. 1 to 3 are denoted by the same reference numerals as those in the embodiment shown in FIGS.

According to a fourth aspect of the present invention, as shown in FIG.
Mold base 4 and mirror surface pieces 1 and 2 for the entrance side and the imaging side lens
The mirror blocks ₁ and ₂ are moved in the Y ₁ and Y ₂ directions by controlling the position of the wedge block in the height direction with the fixing bolt 5. Thus, the positions of the mirror pieces 1 and 2 are adjusted.

FIG. 5 is a view for explaining another embodiment of the optical imaging element injection molding die and the method of assembling the same according to the present invention. In FIG.
1 to 4 are denoted by the same reference numerals as those in the embodiment shown in FIGS. 1 to 4.

As shown in FIG. 5, the invention of claim 5 uses an adjusting bolt 6 instead of the wedge block 10 of the embodiment shown in FIG. The position of the mirror piece for the image side lens is moved and adjusted in the Y ₁ and Y ₂ directions and fixed.

[0031]

According to the first aspect of the present invention, an incident side lens located on the incident side and an optical axis which is formed optically equivalent to the incident side lens and is orthogonal to the optical axis of the incident side lens are described. An imaging-side lens that is located on the imaging side, and both the optical axis of the incident and imaging-side lenses are in a plane formed by the optical axes of these lenses between the incident and imaging-side lenses. An optical imaging element injection molding die for forming an optical imaging element comprising a roof prism having a ridge line arranged so as not to be orthogonal to the roof prism, and an incident side lens for forming the incident side lens A mirror piece for image forming side, a mirror piece for image side lens for forming the image side lens, and a mirror piece for roof prism for forming the roof prism. In the mounting method, the incident side and the The position deviation between the optical axis for the mirror surface piece for the imaging side lens and each lens forming surface and the angular deviation between the optical axis for the prism forming portion of the mirror surface piece for the roof prism, and Since the positions of the mirror pieces are corrected and adjusted with the correction amount corresponding to the shift amount, it is possible to assemble the mirror pieces with high accuracy, and to obtain a high quality molded product.

According to a second aspect of the present invention, in the first aspect of the present invention, the measured position shift and angular shift are comprehensively calculated, and the position of each mirror surface piece is corrected with a correction amount corresponding to the calculated total shift amount. , The mirror piece can be assembled with high accuracy, and a high quality molded product can be obtained.

According to a third aspect of the present invention, in accordance with the first or second aspect of the present invention, since the correction and adjustment of the position of each mirror surface piece is processing on the mounting reference surface of each mirror surface piece, the mirror surface pieces are assembled with high precision. And a high quality molded product can be obtained. Furthermore, the displacement of the mirror piece due to the resin pressure during molding can be reduced.

According to a fourth aspect of the present invention, there is provided an incident-side lens located on the incident side, and an optical axis formed optically equivalent to the incident-side lens and orthogonal to the optical axis of the incident-side lens. Between the image-forming lens located on the image-forming side and the optical axis of these lenses between the light-entering and image-forming lenses and not orthogonal to any of the optical axes of the light-entering and image-forming lenses. Mold for forming an optical imaging element comprising a roof prism having a ridgeline arranged as described above, and a mirror surface for an entrance-side lens for forming the entrance-side lens A mirror, a mirror surface piece for the imaging side lens for forming the imaging side lens, a mirror surface piece for the roof prism for forming the roof prism, and a mold base for these mirror surface pieces. In image element injection molding dies Since a wedge for adjusting the position of each mirror surface piece with respect to the mold base is provided between the mold base and each mirror surface piece, it is possible to assemble the mirror surface piece with high precision, and to achieve high quality molding. Goods can be obtained.

According to a fifth aspect of the present invention, there is provided an incident-side lens located on the incident side, and an optical axis formed optically equivalent to the incident-side lens and orthogonal to the optical axis of the incident-side lens. Between the image-forming lens located on the image-forming side and the optical axis of these lenses between the light-entering and image-forming lenses and not orthogonal to any of the optical axes of the light-entering and image-forming lenses. Mold for forming an optical imaging element comprising a roof prism having a ridgeline arranged as described above, and a mirror surface for an entrance-side lens for forming the entrance-side lens A mirror, a mirror surface piece for the imaging side lens for forming the imaging side lens, a mirror surface piece for the roof prism for forming the roof prism, and a mold base for these mirror surface pieces. In image element injection molding dies Because it has an adjusting bolt for adjusting the position of the respective optical insert relative to the mold base over scan, it is possible to assembly of high-precision optical insert, it is possible to obtain a high-quality molded articles.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating an example of a mirror piece and a mold base of an optical element mold to which the present invention is applied.

FIG. 2 is a main part configuration diagram for describing an embodiment of an optical imaging element injection molding mold and an assembling method thereof according to the present invention.

FIG. 3 is a main part configuration diagram for explaining another embodiment of an optical imaging element injection molding die and an assembling method thereof according to the present invention.

FIG. 4 is a main part configuration diagram for explaining another embodiment of the optical imaging element injection molding die and the method of assembling the same according to the present invention.

FIG. 5 is a view for explaining another embodiment of the optical imaging element injection molding die and the method of assembling the same according to the present invention.

FIG. 6 is a perspective view illustrating an example of an optical imaging element.

FIG. 7 is a diagram for explaining a lens position shift of the optical imaging element shown in FIG. 6 and a shift of an image forming position due to a fall of a prism.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Mirror surface piece for entrance side lenses, 1a, 2a ... Mirror surface part, 2 ...
Mirror surface piece for imaging side lens, 3 ... Mirror surface piece for prism, 4, 5
... mold base, 4a ... reference plane, 6, 7 ... optical axis measuring device,
8 ... frame collapse measuring device, 9 ... spacer 10, 10 '... wedge block, 11, 11 _n, 11 _{n + 1} ... incident-side lens, 1
2, 12 _n , 12 _{n +1} ... imaging side lens, 13 ... roof prism, a ... displacement of the entrance side lens, b ... displacement of the imaging side lens, B4, B5 ... fixing bolts, B6, B1
1, B12, B13, B21, B22, B31 ... adjusting bolt, c ... shift imaging position, d ... cut width, X ... arrangement direction, Y _1, Y ₂ ... adjustment direction, theta ₁ ... image side optical axis The falling angle of
θ ₂ : falling angle of the prism, φ ₁ , φ ₂ , φ ₃ : optical axis, Δ
φ ₁ , Δφ ₂ : Optical axis deviation, Δφ ₃ : Piece tilting amount.

Continued on the front page (72) Inventor Shinya Senoo 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd.

Claims (5)

[Claims] An incident side lens located on the incident side, and an optical axis formed optically equivalent to the incident side lens and orthogonal to the optical axis of the incident side lens, on the image forming side. The imaging-side lens is located between the incident-side and imaging-side lenses, and is disposed in a plane formed by the optical axes of these lenses so as not to be orthogonal to any of the optical axes of the incident-side and imaging-side lenses. An optical imaging element for forming an optical imaging element comprising a roof prism having a curved ridge line, and a mirror piece for an incident-side lens for forming the incident-side lens; In the method of assembling an injection molding mold for an optical imaging element having a mirror piece for an image-forming lens for forming an image-side lens and a mirror piece for a roof prism for forming the roof prism, And mirror for imaging side lens Correction corresponding to each of the deviation amounts while measuring the positional deviation between the surface axis and each optical axis with respect to each lens forming surface and the angle deviation between each optical axis with respect to the prism forming portion of the roof prism mirror surface element. A method for assembling a mold for injection molding of an optical imaging element, wherein the position of each mirror piece is corrected and adjusted by an amount. 2. The method for assembling a mold for injection molding of an optical imaging element according to claim 1, wherein the measured positional shift and angular shift are comprehensively calculated and correspond to the calculated total shift amount. A method for assembling a mold for injection molding of an optical imaging element, wherein the position of each mirror surface piece is corrected and adjusted with a correction amount. 3. The method for assembling a mold for injection molding of an optical imaging element according to claim 1, wherein the correction adjustment of the position of each mirror surface piece is a process on a reference mounting surface of each mirror surface piece. A method for assembling a mold for injection molding of an optical imaging element. 4. An image forming side having an incident side lens located on the incident side and an optical axis formed optically equivalent to the incident side lens and orthogonal to the optical axis of the incident side lens. The imaging-side lens is located between the incident-side and imaging-side lenses, and is disposed in a plane formed by the optical axes of these lenses so as not to be orthogonal to any of the optical axes of the incident-side and imaging-side lenses. An optical imaging element for forming an optical imaging element comprising a roof prism having a curved ridge line, and a mirror piece for an incident-side lens for forming the incident-side lens; For injection molding of an optical imaging element having a mirror piece for an imaging lens for forming an image side lens, a mirror piece for a roof prism for forming the roof prism, and a mold base for these mirror pieces. In the mold, the mold base and A wedge for adjusting a position of each mirror surface piece with respect to the mold base is provided between each mirror surface piece and an optical imaging element injection molding die. 5. An imaging lens having an incident lens located on the incident side and an optical axis formed optically equivalent to the incident lens and orthogonal to the optical axis of the incident lens. The imaging-side lens is located between the incident-side and imaging-side lenses, and is disposed in a plane formed by the optical axes of these lenses so as not to be orthogonal to any of the optical axes of the incident-side and imaging-side lenses. An optical imaging element for forming an optical imaging element comprising a roof prism having a curved ridge line, and a mirror piece for an incident-side lens for forming the incident-side lens; For injection molding of an optical imaging element having a mirror piece for an imaging lens for forming an image side lens, a mirror piece for a roof prism for forming the roof prism, and a mold base for these mirror pieces. In the mold, the mold base An injection molding die for an optical imaging element, comprising: an adjusting bolt for adjusting the position of each mirror surface piece with respect to the other.