JP3095213B2 - Hologram position inspection method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for inspecting whether or not a hologram for diffracting a light from a light source for reproduction in a predetermined direction is attached to a predetermined position on a transparent plate.

[0002]

2. Description of the Related Art Conventionally, holograms having excellent wavelength selectivity have been expected to be applied to head-up displays and the like. When used for up-display, the optical system with the light source for reproduction is shifted, and in order to use light efficiently, it is necessary to inspect whether it is accurately adhered to a predetermined position,
Conventionally, the inspection has been performed by a method of measuring whether or not a predetermined position is set with a glass edge or the like as a base point.

[0003]

However, although the hologram is slightly colored, it is almost colorless and transparent, and the transparent plate is also transparent. This is time consuming, and the tendency is more remarkable especially in the case of curved glass in which the transparent plate is bent three-dimensionally, such as a windshield for an automobile.

[0004] The present invention has been made in view of such a point, and it is easy to detect the edge of a hologram, and it is possible to extremely easily check whether or not the hologram is stuck within an allowable range. It is an object to provide a method and an inspection device.

[0005]

A position inspection method according to the present invention is a method for inspecting the position of a hologram provided on a transparent plate, wherein the transparent plate is disposed at a reference position.
Either use a light-shielding plate between the maximum and minimum outlines of the allowable range with respect to the reference position where the hologram is arranged, and use a translucent plate for the rest, or use the maximum and minimum outlines with the allowable range with the reference position. The inspection plate composed of a light-transmitting plate and the remaining portion formed of a light-shielding plate is disposed at a reference position, and the hologram is at a predetermined position by the diffracted light of the hologram or the light obtained by removing the diffracted light from the light source. Or not.

[0006] Further, as an inspection apparatus for concretely carrying out this method, a mounting table which is supported so as to substantially conform to the curvature of a plate-like body and has a positioning stopper, and a part of the mounting table, An inspection plate that is disposed so as to be substantially in close contact with the plate when the transparent plate is placed, and that shields or transmits a portion formed by the maximum outer shape and the minimum outer shape at the reference position of the hologram. At least a hologram reproducing light source disposed below the inspection plate is provided, and it is more preferable that the mounting table is constituted by a plurality of vertically movable support rods, and the inspection plate is also constituted to be vertically movable.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A hologram is generally applied to a reflection material or a transmission hologram having interference fringes formed by irradiating a photosensitive material such as dichromated gelatin or a photopolymer with a laser beam having a predetermined wavelength from two directions. Can be.

The transparent plate is specifically intended for a curved windshield (laminated glass) for vehicles such as automobiles and airplanes, but it is also possible to use a separate combiner for a head-up display. Yes,
In this case, a transparent resin such as a polycarbonate resin and an acrylic resin can be used other than the single plate glass.

The hologram is attached to a windshield for an automobile or the like after attaching to the concave surface (intermediate film side) surface of the outer glass plate or the convex surface (intermediate film surface) of the inner glass plate using a double-sided adhesive tape. By using an intermediate film such as polyvinyl butyral between the inner glass plate and the outer glass plate, a normal autoclave treatment is performed to obtain a windshield, and the windshield is inspected according to the present invention. Inspection is preferable because the plate glass on which the hologram is adhered can deviate from the standard and can be used again, but it may be inspected whether or not it is adhered to a predetermined position after the alignment process.

[0010] The inspection device supports the transparent plate-like body so as to substantially conform to the curvature of the transparent plate-like body, and has a mounting table having a positioning stopper, and when the transparent plate-like body is mounted on a part of the mounting table. An inspection plate which is arranged so as to be in close contact with the plate-like body from the rear surface, and which shields or transmits a portion formed by the maximum and minimum external shapes at the reference position of the hologram; and a hologram reproducing device disposed below the inspection plate At least a light source is provided, and the mounting table is composed of a plurality of vertically movable support rods, and if the inspection plate is also configured to be vertically movable, only the length of the support rod is changed even if the curvature of the transparent plate is changed. Is more preferable. In the case of a reflection hologram, the inspection plate is brought into close contact with the hologram on the surface of the glass sheet (above the glass sheet), and the light source is arranged above.
The light may be diffracted upward by the hologram, and the diffracted light may be inspected from above and the light not diffracted from below (light obtained by removing the diffracted light from the light source).

In order to perform an inspection using such an inspection apparatus, first, a transparent plate-like body such as an outside glass plate before the alignment process is placed on the mounting table and is brought into contact with a stopper to perform positioning. Do. At the same time, an inspection plate that shields or transmits light between the maximum outer shape and the minimum outer shape of the allowable range of the reference size of the hologram is brought into close contact with the back surface of the transparent plate.

The inspection plate is cut out of a light-shielding plate such as a black filter or a light-attenuating plate such as a gray filter into a width of a maximum allowable outer shape and a minimum allowable outer shape of a standard size of the hologram, and affixed to a transparent plate such as a sheet glass. Inspection plate that shields the width of the maximum allowable external shape and minimum allowable external shape, or conversely, cuts out the plate that shields the light to the width of the maximum allowable external shape and minimum allowable external shape of the standard size of the hologram, and transmits this part. Since the inspection plate can be used, and the inspection plate is arranged at a fixed position relative to the mounting table, that is, when the transparent plate is positioned, it corresponds to the position where the hologram is attached. , And accurately indicate the reference position of the hologram. It is preferable that the surface of the inspection plate is coated with an anti-reflection film or the like so as to reduce reflected light, because it can be easily distinguished from other hologram parts.

The light source may be a light source that generates light of a hologram reproduction wavelength, and a white light source, which is a light source including all wavelengths, is optimal. However, it is needless to say that a laser light source that emits light of a reproduction wavelength is also used. Can be. In this case, in the case of a transmission hologram, the light source may be almost brought close to the hologram as shown in the first embodiment. However, in the case of a reflection hologram, the light is diffracted toward the light source, so that it is necessary to separate the light source as in the second embodiment. is there.

In this state, when the light from the light source is irradiated on the inspection board, only the width of the maximum allowable outer shape and the width of the minimum allowable outer shape are changed.
The light from the light source is blocked or transmitted. If the hologram is placed within the range of the permissible width over the entire circumference, both the size and the mounting position of the hologram are passed, but if any part of the hologram is out of position, it is rejected.

If the hologram is arranged in the range of the allowable width over the entire circumference when the portion of the allowable width is shielded, the innermost portion is transmitted and diffracted by the hologram. In other words, in the case of a transmission hologram, it can be seen from the side opposite to the light source (above), and in the case of a reflection hologram, it can be seen from the side of the light source (below). Since the light except the diffracted light from the light source (for example, pink light) goes straight, when the light source is viewed from the side opposite to the light source, the light obtained by removing the diffracted light from the light source can be visually recognized. In addition, if there is a dark part that is shielded from light over the entire outer periphery of the hologram diffraction part, the result is acceptable.

That is, if the hologram diffraction portion is inside and the light-shielding portion is outside, the result is acceptable, but in other cases, the size of the hologram is too large or the mounting position is shifted and a part of the peripheral portion is removed. This is not true if the hologram is diffracted further outside the light-shielding part in the above, or if the hologram is small in size and there is no dark part around the entire circumference, and if there is a light-transmitting part that is neither diffraction nor light-shielding in some peripheral parts. Passed.

In the case where the hologram is transmitted through the allowable width, if the hologram is arranged within the allowable width over the entire circumference,
The light from the light source is diffracted by the hologram over the entire circumference, with the inside being shielded from light.For example, green diffracted light can be viewed from the diffraction direction, that is, from above in the case of a transmission hologram, and from below in the case of a reflection hologram. In addition, light that is not diffracted (for example, pink light excluding the diffracted light from the light source) goes straight, so if you look at the light source from the opposite side of the light source, you can see the light excluding the diffracted light from this light source. can do. Further, if there is a portion where light is transmitted or reflected as it is over the entire outer periphery of the hologram reproducing portion and the light is shielded by the light shielding plate over the entire outer periphery, the result is acceptable.

In this case, a portion where light is transmitted or reflected is a case where light is applied to a light transmitting portion, and when transmitted or reflected in the same direction as the diffraction angle, the portion can be visually recognized brightly. Is transmitted or reflected in a direction different from the diffraction angle, so in that case it becomes dark, but at least there is light reflected on the front surface and light transmitted and reflected on the back surface. It is possible.

In other cases, that is, the size of the hologram is too large or the mounting position is shifted, and there is no light transmitting or reflecting portion in a part of the peripheral portion, and there is a light shielding portion outside the reproduction portion of the hologram. If
If the size of the hologram is too small and there is no hologram diffraction portion outside a part of the light-shielding portion and there is a portion through which light is transmitted or reflected, the test is failed.

In the case where light having a permissible width is transmitted, it is possible to measure the position of the hologram edge with respect to the reference size.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic perspective view showing an inspection apparatus of the present invention,
2 and 3 are partial cross-sectional views each showing a main part of the inspection apparatus according to the first and second embodiments. FIG. 4 is a plan view showing a main part in which a hologram is attached to a transparent plate. 5 is a main part plan view showing a state when the hologram side is seen from above in Example 1, and FIG. 6 is a main part plan view showing a state when the hologram side is seen from below in Example 2; It is.

Embodiment 1 A case where a transmission hologram is inspected by an inspection plate which shields a portion having an allowable width from light will be exemplified.

A hologram 1 in which a photosensitive material such as a photopolymer or a dichromated gelatin is irradiated with laser light from two directions to form interference fringes and records the hologram 1 is a transparent plate which is a curved outside windshield of an automobile or the like. Shape 2
After applying a double-sided adhesive tape to the concave surface (intermediate film side) of the surface of the car, a normal autoclave treatment is performed between the inner glass plate and the intermediate glass such as polyvinyl butyral, etc., and a bonding process is performed to obtain a windshield. However, the inspection of the present invention is performed before performing the alignment process.

The hologram should be stuck to the transparent plate at the reference position shown by the dashed line S in FIG. 4, but it is difficult to actually attach it to this position without error. There, since the reference position S is allowed in, for example, of 1 to several mm large range of outer S _L and the reference position S of, for example, 1 to several mm low profile S _S, the allowable range of the maximum outer shape S _L and standards A pass is obtained if the hologram is attached between the minimum outer shapes S _S of the allowable range smaller than the position S (the hatched portion in the figure).

A preferred example of the inspection apparatus of the present invention is shown in FIG.
As shown in, table 3 comprises a plurality of vertically movable support rod 3 ₂ having a support table 3 ₁ to the tip, the support table 3 ₁ to match the transparent plate-shaped object 2 of curvature, such as plate glass Formed.

In this case, the outer support rod is a horizontal X-axis,
When connected via a universal joint so that it can be freely moved in the Y-axis direction and the vertical direction and the Z-axis direction, and each support can be rotated in all directions as a joint with the support rod, it matches the curvature of the transparent plate. It is preferable because it can be performed.

Further, the transparent plate-like member 2 is attached to the three outer support rods.
A rod-shaped stopper 4 with which the end surface of the rod comes into contact is attached. Further, as shown in FIG. 2, when the transparent plate-shaped body 2 is placed, the inspection plate 5 is brought close to the position where the transmission hologram 1 is stuck on the plate-shaped body almost from the back surface, and the white plate is turned on. placing via a universal joint to the distal end of the support rod 5 _first vertically movable together with the playback light source 6, such as.

The test plate 5 is cut a plate 5 ₂ for shielding, such as black on the width of the portion (shaded portion) which is formed by the maximum permissible external S _L and minimum allowable external S _S with respect to the reference position S of the hologram, It is configured to be adhered to a transparent substrate such as thin glass or polyethylene terephthalate.

Further, a video camera 7 is arranged above the hologram. A procedure for inspecting the position of a hologram using such an apparatus will be described. First, hologram 1
Is placed on a mounting table 3 which is adjusted in advance so as to match the curvature of the transparent plate, and the transparent plate is placed on three stoppers 4. The transparent plate is placed at the reference position by bringing the end surfaces of the plate into contact. At this time, the height of the inspection plate 5 is adjusted so as to match the curvature of the transparent plate.

In this state, when the hologram 1 is irradiated with light from the reproduction light source 6, if the entire peripheral edge of the hologram is placed in the hatched portion, as shown in FIG. is diffracted in the direction of the video camera 7 by the hologram, e.g., visible green, is acceptable if there is shading portions over part four sides all around indicated by reference numeral 5 ₂ outside thereof.

If the position of the hologram is deviated, the periphery of the reproduced portion of the hologram includes, for example, a portion that is not reproduced as a hologram on the left side and a portion that directly transmits light from the light source and a light-shielded portion, and a portion on the right side. Is unacceptable because there is a light-shielding portion and a hologram reproducing portion outside the hologram reproducing portion, and as in this case, there is no light-shielding portion over the entire outer periphery of the hologram reproducing portion.

When the light source side is viewed from the human eye 8 in the case of the present embodiment, the hologram portion indicated by reference numeral 1 shows that the light not diffracted (light obtained by removing the diffracted light from the light source) is, for example, pink. Since it looks like a color, it can be identified from this direction.

It is also possible to output a light / dark signal from a video camera to an image processing device (not shown) or the like to automatically identify the signal. As shown in Example 2 Figure 3, the light shielding plate 5 ₂ black cut out a portion of the allowable width translucent (reference numeral 5 ₃₎ As to the test plate 5 '
A case where the reflection hologram 1 ′ is inspected will be exemplified.

The inspection plate 5 'is obtained by cutting out a light-shielding plate into a width of a maximum allowable outer shape and a minimum allowable outer shape of a standard size of the hologram so as to transmit light, and the light source 6' and the video and a camera 7 'mounted on the distal end of the support rod 5 ₁ incorporated integrally.

Using such a device, the hologram 1 '
The procedure for inspecting the position of is described. First, the plate-shaped body 2 such as a plate glass to which the hologram 1 'has been stuck and before performing the alignment process is placed on the mounting table 3 in the same manner as in Example 1, and the transparent plate-shaped body is placed at the reference position. When the hologram 1 'is irradiated with light from the reproduction light source 6' in this state, if the entire peripheral edge of the hologram is placed in a portion having an allowable width, the inside of the hologram is shielded as shown in FIG. There is a portion where, for example, green light is diffracted by the hologram in the direction of the video camera 7 'over the entire periphery thereof, and the light is transmitted or reflected as it is over the entire periphery of the hologram reproduction portion. The test passes if the light is shielded by the light-shielding plate over the entire outermost circumference.

In other cases, that is, when the size of the hologram is too large, or when the hologram diffraction portion is present outside the outermost light-shielding portion in a part of the peripheral portion due to the mounting position being shifted, the size of the hologram is reduced. If the hologram diffraction portion is not present all around the innermost light-shielding portion and the light-transmitting portion is partially present, the test is failed.

When the light source side is viewed from the human eye 8 in the case of the present embodiment, the hatched portion indicated by reference numeral 1 indicates that the light that has not been diffracted (light obtained by removing the diffracted light from the light source) is, for example, pink. Since it looks like a color, it can be identified from this direction.

[0038]

According to the inspection method and the inspection apparatus of the present invention,
In addition to being able to easily detect the edge of a hologram, which has been extremely difficult in the past, it is possible to easily and quickly inspect whether or not the hologram is stuck within a predetermined allowable range.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an inspection device of the present invention.

FIG. 2 is a partial cross-sectional view illustrating a main part of the inspection device according to the first embodiment.

FIG. 3 is a partial cross-sectional view illustrating a main part of an inspection device according to a second embodiment.

FIG. 4 is a main part plan view showing a state in which a hologram is stuck to a transparent plate.

FIG. 5 is a main part plan view showing a state when the hologram side is seen through from above in Example 1.

FIG. 6 is a main part plan view showing a state when the hologram side is seen through from below, in Example 2.

[Explanation of symbols]

 1, 1 'hologram 2 transparent plate 3 mounting table 4 stopper 5, 5' inspection plate 6, 6 'light source 7, 7' video camera

Continuation of the front page (58) Fields investigated (Int.Cl. ⁷ , DB name) G01B 11/00 G03H 1/02 G02B 5/32 G02B 27/02 B60K 35/00 B60J 1/02 G09F 9/00 359 G01N 21/84

Claims (4)

(57) [Claims] 1. A method for inspecting a position of a hologram provided on a transparent plate-shaped object, wherein the method comprises the steps of: when the transparent plate-shaped object is disposed at a reference position, an allowable range between the reference position where the hologram is disposed. A test plate composed of a light-shielding plate between the maximum and minimum outer shapes and a light-transmitting plate as the rest is disposed at a reference position, and the hologram is formed by diffracted light of the hologram or light obtained by removing the diffracted light from a light source. A position inspection method for a hologram, characterized in that it is determined whether or not the hologram is at a predetermined position. 2. A method for inspecting a position of a hologram provided on a transparent plate-like body, wherein the transparent plate-like body is disposed at a reference position, and the hologram is located at a reference position where the hologram is disposed. A test plate composed of a light-transmitting plate between the maximum and minimum outer shapes and a light-shielding plate for the remaining portion is disposed at a reference position, and the hologram is formed by diffracted light of the hologram or light obtained by removing the diffracted light from a light source. A position inspection method for a hologram, characterized in that it is determined whether or not the hologram is at a predetermined position. 3. An apparatus for inspecting the position of a hologram provided on a transparent plate-like body, comprising: a mounting table that is supported so as to substantially match the curvature of the plate-like body and has a positioning stopper; and a part of the mounting table. An inspection in which, when the transparent plate is placed, the plate is disposed so as to be in close contact with the plate from the back surface, and a portion formed by the maximum outer shape and the minimum outer shape at the reference position of the hologram is shielded or transmitted. A hologram position inspection apparatus comprising at least a plate and a light source for reproducing a hologram disposed below the inspection plate. 4. The hologram position inspection apparatus according to claim 3, wherein the mounting table is constituted by a plurality of vertically movable support rods, and the inspection plate is also vertically movable.