JP2005284066A - Variable focus lens, and instrument and display using variable focus lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a variable focus lens such that a marginal characteristic of a lens peripheral edge can be improved, a degree variation range can be made wide, and the outward appearance is prevented from becoming worse owing to an adhesive at the peripheral edge of the lens and to provide an instrument and a display using the variable focus lens. <P>SOLUTION: The variable focus lens is formed by arranging an elastic transparent film 3 covering the top surface of a rigid transparent substrate 2, bonding peripheral edges of the transparent substrate 2 and transparent film 3 together with an adhesive, and charging transparent liquid 8 between the transparent substrate 2 and transparent film 3. The adhesive 4 is applied to the peripheral edge end surface of the transparent substrate 2 and the reverse-side peripheral edge part of the transparent film 3 to bond the transparent film 2 and transparent substrate 2 together. The transparent substrate 2 is provided with a flow passage 5 for the transparent liquid. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a variable focal length lens having a structure in which a focal length of a lens is changed by filling a transparent liquid inside a transparent film with a peripheral edge bonded so as to cover a transparent substrate and changing a filling amount of the transparent liquid. And an instrument and a display using the variable focus lens.

  Conventionally, as a variable focus lens capable of changing a focal length of a lens, a variable focus lens having a structure in which a transparent elastic film is stretched on both sides of a circular ring-shaped support frame and a transparent liquid is filled therein is disclosed in Patent Document 1 below. Etc. have been proposed. This variable focus lens has a problem that the transparent elastic films on both sides are easily deformed due to the weight of the transparent liquid filled therein, and the lens surface is unevenly deformed to deteriorate the performance of the lens.

  Therefore, a variable focus lens has been proposed in which one surface of the lens body is formed of a transparent plate having high rigidity, the other surface is formed of a transparent synthetic resin plate that can be elastically deformed, and the inside is filled with a transparent liquid. In this variable focus lens, one surface of the lens body is formed of a transparent plate having high rigidity, a support frame is fitted around the transparent plate, and the transparent plate can be elastically deformed through a space in front of the transparent plate. A synthetic resin plate was attached to the support frame. In addition, this variable focus lens is sealed by inserting a rubber O-ring between the support frame and the peripheral portion of the transparent plate and between the support plate and the peripheral portion of the transparent synthetic resin plate. Thus, leakage of the transparent liquid inside is prevented and uniform deformation is caused in the transparent synthetic resin plate.

  However, in this variable focus lens, although the transparent synthetic resin plate is less likely to be unevenly deformed and relatively good lens performance can be obtained, the transparent plate and the transparent synthetic resin plate have a peripheral portion. The structure is fixed to the inside of the support frame so that the shape of the support frame is thicker and larger, and the amount of transparent liquid that fills the inner side of the transparent synthetic resin plate increases. In addition, there is a problem that the structure becomes complicated and the number of parts increases because an O-ring or the like is used.

Therefore, according to the following Patent Document 2, the present inventor arranges a transparent film having elasticity so as to cover the convex surface on the convex surface side of the rigid lens formed in a lens shape having rigidity, and the transparent film A variable focus lens was proposed in which the periphery of the lens was adhered to the surface of the rigid lens from the front side, and a transparent liquid was filled between the rigid lens and the transparent film.
JP 55-36857 A JP 2002-107678 A

  However, in this variable focus lens, the transparent film is disposed on the convex side of the rigid lens so as to cover the convex surface, and the periphery of the transparent film is adhered to the surface of the rigid lens. Although the amount of transparent liquid that enters is small and the thickness of the lens body can be reduced, an adhesive is applied to the front surface of the peripheral edge of the rigid lens when the peripheral edge of the transparent film is bonded to the front surface of the rigid lens. However, in order to hold down and adhere it at the peripheral edge of the transparent film, there is a problem that the adhesive strength at the peripheral edge of the transparent film tends to deteriorate when the bulge amount at the time of the bulge of the lens peripheral edge is large. Furthermore, the pressed adhesive oozes out to the inside of the rigid lens, and the shape of the adhesive layer expands inward, and the expanded shape of the adhesive spreads randomly, deteriorating the appearance of the variable focus lens was there.

  The present invention has been made in view of the above points, and can improve the boundary characteristics of the lens periphery, increase the adhesive strength of the lens periphery, and increase the variable range of power. Another object is to provide a variable focus lens that can eliminate the deterioration of the appearance due to the adhesive at the peripheral edge of the lens. Furthermore, an object of the present invention is to provide an instrument and a display that can display a display surface in an easy-to-view manner with a variable focus lens.

  In order to achieve the above object, in the variable focus lens of the present invention, a transparent film having elasticity is disposed so as to cover the surface of a transparent substrate having rigidity, and the peripheral portion of the transparent substrate and the transparent film is formed by an adhesive. A variable focus lens that is bonded and filled with a transparent liquid between the transparent substrate and the transparent film, and the transparent film and the transparent substrate are bonded to each other by attaching an adhesive to the peripheral edge of the transparent substrate and the peripheral edge of the back surface of the transparent film. It is bonded and a transparent substrate is provided with a passage for transparent liquid distribution.

  Here, the variable focus lens has a tube connected to the outlet of the passage provided in the transparent substrate, an injector connected to the tip of the tube, and the filling amount of the transparent liquid by the injector. The focal length can be changed by changing.

  According to a third aspect of the present invention, a transparent film is adhered to both the front and back surfaces of the transparent substrate, and a transparent liquid can be filled between the front and back surfaces of the transparent substrate and the transparent films on both sides.

  According to a fourth aspect of the present invention, the transparent substrate can be formed of a flat transparent plate.

  Furthermore, as in claim 5, the transparent substrate can be formed with a convex surface bulging in a convex shape on the transparent film side.

  The variable focus lens having such a configuration is used as a convex lens for a magnifying glass such as a loupe. By changing the filling amount of the transparent liquid that fills the inside of the transparent film by, for example, a syringe type injector, the curvature of the lens surface changes, and the lens power is adjusted. The transparent liquid is supplied between the transparent substrate and the transparent film by a syringe-type injector through a passage and a tube provided in the transparent substrate, for example, and the filling amount is changed.

  In this variable focus lens, since the transparent film and the transparent substrate are bonded to each other by attaching an adhesive to the peripheral edge surface of the transparent substrate and the back surface peripheral portion of the transparent film, the transparent film is attached to the front peripheral edge of the transparent substrate as in the past. As compared with the case of bonding, the rising edge at the bulging of the peripheral portion of the transparent film can be improved, and thereby the boundary characteristics at the lens peripheral portion can be improved.

  That is, in the past, since the back surface of the peripheral edge of the transparent film was adhered so as to overlap the front peripheral edge of the transparent substrate, rising of the peripheral edge during the swelling of the transparent film was suppressed, and there was a problem with the boundary characteristics of the lens peripheral edge. However, according to the present variable focus lens, it is possible to improve the rise at the time when the peripheral portion of the transparent film bulges and to improve the boundary characteristics at the peripheral portion of the lens. Further, according to the present variable focus lens, since the transparent film is adhered as described above, the adhesive strength at the peripheral portion is improved, the transparent film can be expanded in a wide range, and the variable range of the lens power can be increased. Can be bigger. And since an adhesive agent adhere | attaches the peripheral edge surface of a transparent substrate, and the back surface peripheral part of a transparent film, a transparent film can adhere | attach with sufficient adhesive strength.

  Further, since the adhesive is attached to the peripheral edge of the back surface of the transparent film, an adhesive layer is provided on the peripheral edge of the lens like a variable focus lens that adheres the transparent film to the peripheral edge of the front surface of the transparent substrate as in the past. It does not spread so as to spread, and the deterioration of the appearance of the lens peripheral edge due to the adhesive can be solved.

  Further, the invention of claim 10 is an instrument in which a variable focus lens is disposed on the front surface of the instrument panel, and the variable focus lens is provided with a transparent film having elasticity covering the surface of a transparent substrate having rigidity. The transparent substrate and the peripheral edge of the transparent film are adhered by an adhesive, and a transparent liquid is filled between the transparent substrate and the transparent film, and the adhesive is applied to the peripheral edge of the transparent substrate and the peripheral edge of the back surface of the transparent film. The transparent film and the transparent substrate are adhered to each other, a passage for transparent liquid circulation is provided in the transparent substrate, a tube is connected to the outlet of the passage, an injector is connected to the tip of the tube, and the transparent is made by the injector The focal length of the lens is changed by changing the filling amount of the liquid. According to the meter of the present invention, the variable focus lens can be used as a convex lens to enlarge and display the dial and the pointer that are the display surface of the meter, and further, by adjusting the filling amount of the transparent liquid by the injector, By adjusting the power of the lens in accordance with the visual acuity of the person viewing the instrument, it is possible to perform an enlarged display of the instrument in a state that is easy for the viewer to see.

  Furthermore, the invention of claim 15 is a display device in which a variable focus lens is disposed on the front surface of the display unit, and the variable focus lens is formed of an elastic transparent film covering the surface of a transparent substrate having rigidity. Disposed, the peripheral portion of the transparent substrate and the transparent film are bonded via the frame, and the transparent liquid is filled between the transparent substrate and the transparent film, and the frame is bonded to the upper surface of the transparent substrate, Adhesive is applied to the upper surface of the frame body, the transparent film and the frame body are adhered, a passage for transparent liquid circulation is provided on the transparent substrate, a tube is connected to the outlet of the passage, and an injector is connected to the tip of the tube The focal length of the varifocal lens is changed by changing the filling amount of the transparent liquid with an injector.

  According to the display device of the present invention, the display surface of the display device can be enlarged and displayed using the variable focus lens as a convex lens, and the display device can be viewed by adjusting the filling amount of the transparent liquid with the injector. By adjusting the power of the lens according to the human eyesight, it is possible to perform an enlarged display of the display in a state that is easy for the viewer to see.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of the variable focus lens of the first embodiment, and FIG. 2 is a bottom view thereof. In this variable focus lens, a transparent film 3 having elasticity is disposed so as to cover the surface of the transparent substrate 2 having rigidity, and the periphery of the transparent substrate 2 and the transparent film 3 is bonded by an adhesive 4. 2 and the transparent film 3 are filled with a transparent liquid 8.

  The transparent substrate 2 is formed by cutting a flat transparent glass plate or a transparent synthetic resin plate into a circular shape and has at least rigidity enough to retain the shape, and a transparent liquid is taken in and out of a part thereof. A passage (through hole) 5 is formed, and a tube 6 is connected to the outlet of the passage 5.

  The transparent film 3 covering the surface of the transparent substrate 2 is formed into a thin film shape with a synthetic resin having moderate elasticity, for example, a silicon resin, a vinyl chloride resin, a thermoplastic elastomer, and the thickness is 0.2 mm. About 1.5 mm, and desirably a thickness of 0.3 mm to 1.2 mm. A transparent liquid 8 such as silicon oil, ethylene glycol, glycerin, or water is filled in the internal space between the transparent substrate 2 and the transparent film 3 whose peripheral portions are sealed with the adhesive 4.

  When the transparent film 3 is bonded onto the transparent substrate 2, a method of bonding with an adhesive from the back side thereof is employed. In other words, the transparent film 3 and the transparent substrate 2 are overlapped to face each other, and an adhesive 4 such as cyanoacrylate or silicon is applied to the peripheral edge of the transparent substrate 2 and the peripheral edge of the back surface of the transparent film 3. Glue. According to this bonding method, as shown in FIG. 2, the adhesive 4 is applied in the form of a uniform ring on the outer periphery of the transparent substrate 2, and adheres with a good appearance without oozing around. Can do. Moreover, since the adhesive 4 is reliably applied to the peripheral edge of the back surface of the transparent film 3 and the peripheral edge of the transparent substrate 2 and adheres to both, simply apply the adhesive so that it is placed on the peripheral edge. Even in such a case, the transparent film 3 and the transparent substrate 2 can be easily bonded with sufficient adhesive strength. Moreover, the internal space between the transparent film 3 and the transparent substrate 2 is reliably sealed by the adhesion by the adhesive 4.

  On the other hand, a passage 5 for transparent liquid is formed in a part of the transparent substrate 2, a tube 6 is connected to the outlet, and a syringe type injector 7 is connected to the end of the tube 6. A piston is slidably inserted into the syringe-type injector 7, and the injection amount of the transparent liquid is adjusted by an operation of inserting and removing the piston. By operating the injector 7, the filling amount of the transparent liquid in the transparent film 3 and the transparent substrate 2 is adjusted, the forward bulge of the transparent film 3 is changed, the curvature of the lens surface is changed, and the focal point of the lens is changed. Operate to change the distance. Although it depends on the size of the variable focus lens, for example, in the case of a lens having a diameter of about 10 cm, a transparent liquid with an amount of about 5 cc is taken in and out to change the lens power. Syringe injectors can be used.

  The varifocal lens shown in FIGS. 1 and 2 configured as described above is used as a magnifying glass or a magnifying glass by attaching a frame around the lens, for example. The syringe-type injector 7 for transparent liquid can be attached to the frame or gripping part of the loupe. The transparent film 3 and the transparent substrate 2 are filled with a transparent liquid 8 such as silicon oil, ethylene glycol, glycerin, or water through the tube 6 from the injector 7. After filling with the transparent liquid 8, the piston of the syringe type injector 7 is fixed and used, and when changing the lens power, the filling amount of the transparent liquid 8 is adjusted by operating the injector 7. .

  In such a variable focus lens, the transparent film 3 swells forward due to the filling of the transparent liquid 8 into the transparent film 3, and the curvature of the surface of the transparent film 3, that is, the curvature of the lens depends on the filling amount of the transparent liquid 8. And the focal length of the lens changes. At this time, since the transparent film 3 can swell or shrink so that it rises immediately from the peripheral corner of the transparent substrate 2, the boundary characteristics of the lens peripheral part are improved, and a small amount of the transparent liquid 8 is filled. The power of the lens can be effectively changed by the change of. In addition, by operating the piston of the syringe-type injector 7, the amount of the transparent liquid in the transparent film 3 can be easily changed to change the curvature of the lens surface, thereby easily changing the focal length of the lens. In the case of a loupe, the size of the virtual image seen through the loupe can be easily changed.

  In the variable focal length lens having the above-described configuration, as described above, the transparent film 3 is coated on the transparent substrate 2 from the back side with the adhesive 4 along the back side peripheral edge of the transparent film 3, Since it adheres to the end portion, the transparent film 3 can be easily adhered by simply applying an adhesive to the peripheral portion, and the adhesive is placed between the transparent film on the peripheral edge of the transparent substrate as in the prior art. It is possible to manufacture a variable focus lens having a good appearance without oozing out and deteriorating the appearance of the lens.

  The transparent substrate 2 of the varifocal lens of the first embodiment may be a transparent substrate 102 having a shape that bulges to the front side as shown in FIG. A transparent film 103 having elasticity covering the surface of the transparent substrate 102 is disposed on the surface of the transparent substrate 102 having a bulged shape, as described above. The peripheral edge is bonded from the back side of the transparent film 103 by the adhesive 104 applied to the back peripheral edge and the outer peripheral edge of the transparent substrate 102. A passage 105 is formed in a part of the transparent substrate 102, and a transparent liquid 108 is filled between the tube 106 connected to the outlet of the passage 105 and the transparent film 103.

  As shown in FIG. 4, a cylindrical body 9 having a low height can be fixed to the back surface of the transparent substrate 2 of the variable focus lens of the first embodiment, and the cylindrical body 9 is attached to the transparent substrate. By adhering to the back surface of 2, the display portion on the lower surface of the cylindrical body 9 can be sufficiently enlarged.

  FIG. 5 shows a varifocal lens according to the second embodiment. In this example, transparent films 13 a and 13 b are bonded to both front and back surfaces of the transparent substrate 12, and the transparent films 13 a and 13 b on both sides of the transparent film 13 are respectively disposed between the transparent substrates 12. The transparent liquids 18a and 18b are filled. That is, this variable focus lens is provided with transparent films 13a and 13b having elasticity covering the front and back surfaces of the transparent substrate 12 having rigidity, and the front and back surfaces of the transparent substrate 12 and the transparent films 13a and 13b. Peripheral portions are bonded by adhesives 14a and 14b, respectively, and transparent liquids 18a and 18b are filled between the front and back transparent films 13a and 13b of the transparent substrate 12, respectively. A variable focus lens similar to that shown in FIG.

  The transparent substrate 12 is formed by cutting a flat transparent plate glass or a transparent synthetic resin plate into a circle, and has at least rigidity enough to retain the shape, and a part thereof is shown in FIG. Thus, a passage (through hole) 15 for taking in and out the transparent liquid is formed in a substantially T shape, and a tube 16 is connected to an outlet (opening outside) of the passage 15. When the transparent films 13a and 13b are bonded to the front and back surfaces of the transparent substrate 12, the adhesive is applied from the back side of the transparent substrate 12 in the same manner as described above.

  According to this bonding method, the adhesives 14a and 14b are applied in a uniform ring shape on the outer periphery of the transparent substrate 12, and can be bonded with a good appearance without oozing out. Also, since the adhesives 14a and 14b are securely applied to the peripheral edge of the transparent film 13a and 13b and the peripheral edge of the transparent substrate 12 to bond them together, the adhesive is easily placed on the peripheral edge. Even if it is simply applied, the transparent films 13a and 13b and the transparent substrate 12 can be easily bonded with sufficient adhesive strength.

  A passage 15 for transparent liquid is formed in a part of the transparent substrate 12 in a substantially T shape, and a tube 16 is connected to an outlet on the outside. A syringe type injector (not shown) is connected to the end of the tube 16. A piston is slidably inserted into the syringe-type injector, and the injection amount of the transparent liquid is adjusted by an operation of inserting and removing the piston. By operating the injector, the filling amounts of the transparent films 13a and 13b and the transparent liquids 18a and 18b in the transparent substrate 12 are adjusted to change the swelling of the transparent films 13a and 13b.

  In such a variable focus lens, the transparent films 13a and 13b are expanded by filling the transparent films 18a and 18b into the transparent films 13a and 13b, and the transparent films 13a and 13b are filled according to the filling amounts of the transparent liquids 18a and 18b. The curvature of the surface, that is, the curvature of the lens changes, and the focal length of the lens changes. At this time, since the transparent films 13a and 13b can be expanded or contracted so as to rise immediately from the peripheral corner portion of the transparent substrate 12, the boundary characteristics of the lens peripheral portion are good. Furthermore, since the convex lens portions by the transparent films 13a and 13b are formed on both surfaces of the transparent substrate 12, by changing the amount of the transparent liquids 18a and 18b filled in both the transparent films 13a and 13b, the lens power can be changed. It can be changed greatly.

  In the variable focus lens, as described above, the transparent films 13a and 13b are coated with the adhesives 14a and 14b from the front and back of the transparent substrate 12 along the peripheral edges of the transparent films 13a and 13b. Since it adheres to the peripheral edge portions of the front and back surfaces, the transparent films 13a and 13b can be easily bonded simply by applying an adhesive to the peripheral edge portion. Further, the adhesive is transparent at the peripheral edge of the transparent substrate as in the prior art. It is possible to manufacture a variable focus lens having a good appearance without bleeding between the film and the appearance of the lens.

  The transparent substrate 12 of the varifocal lens of the second embodiment may be a transparent substrate 112 having a shape bulging upward on the upper surface side, as shown in FIG. Similarly to the above, the transparent substrates 113a and 113b having elasticity covering the front and back surfaces of the transparent substrate 112 are disposed on the front and back surfaces of the transparent substrate 112 having a convex shape. The peripheral portions of the transparent films 113a and 113b are bonded from the back side of the transparent films 113a and 113b by adhesives 114a and 114b applied to the back peripheral portion and the outer peripheral end portion of the transparent substrate 112. A passage 115 is formed in a part of the transparent substrate 112, and transparent liquids 118a and 118b are filled between the tube 116 connected to the outlet of the passage 115 and the transparent films 113a and 113b on both the front and back surfaces.

  Further, the transparent substrate 12 of the variable focus lens of the second embodiment can be formed in a convex lens shape as shown in FIG. Also in the case of the convex lens-shaped transparent substrate 212, transparent films 213a and 213b are bonded to both front and back surfaces of the transparent substrate 212 in the same manner as described above, and a transparent liquid is provided between the transparent films 213a and 213b and the transparent substrate 212 on both sides. 218a and 218b are filled.

  Furthermore, as shown in FIG. 8, the transparent substrate 12 of the variable focus lens of the second embodiment is formed of two transparent substrates 312a and 312b, and a transparent film 313a is formed on the surface side of each of the transparent substrates 312a and 312b. , 313b and the two transparent substrates 312a and 312b can be fixed in parallel with each other with a cylindrical body 319 interposed therebetween.

  That is, on the surfaces of the transparent substrates 312a and 312b on both sides, the transparent films 313a and 313b are formed on the peripheral edge surfaces of the transparent substrates 312a and 312b and the back surfaces of the transparent films 313a and 313b. 314a and 314b are applied and bonded. Transparent liquids 318a and 318b are filled between the transparent substrate 312a and the transparent film 313a and between the transparent substrate 312b and the transparent film 313b, respectively, and variable focus lenses similar to the above are disposed on the front and back surfaces of the transparent substrates 312a and 312b. Is done. In addition, passages (through holes) 315a and 315b for taking in and out the transparent liquid are formed in a part of the transparent substrates 312a and 312b, and tubes for injecting the transparent liquids 318a and 318b at the exits of the passages. 316 is connected.

  In the varifocal lens having such a configuration, as in the second embodiment, convex lens portions are formed by the transparent films 313a and 313b on both surfaces of the transparent substrates 312a and 312b, and therefore, in both transparent films 313a and 313b. By changing the amount of the transparent liquids 318a and 318b to be filled, the lens power can be greatly changed.

  FIG. 9 shows another form of the above embodiment. In the varifocal lens of this form, two transparent substrates are deleted from the varifocal lens of FIG. 8, and the two transparent substrates 312a and 312b are cylindrical. It is constituted by being bonded to the end of the slab 319. That is, as shown in FIG. 9, the two transparent films 413a and 413b are arranged at the upper end and the lower end of the cylindrical body 419 so as to cover the upper opening and the lower opening, and the two transparent films Adhesives 414a and 414b are applied from the back surface to the outer peripheral edge of each of 413a and 413b, and bonded to the outer peripheral edge of the cylindrical body 319.

  A passage 415 for filling the transparent liquid 418 is formed through a part of the cylindrical body 319, and a tube 416 is connected to the passage 415. For example, a syringe-type injector is connected to the end of the tube 416, and the amount of the lens is changed by adjusting the filling amount of the transparent liquid 418 by operating the syringe-type injector. Since the variable focus lens having such a configuration has convex lens portions formed by the transparent films 413a and 413b on both the front and back surfaces in the same manner as described above, the amount of the transparent liquid 418 filled in the transparent films 413a and 413b is changed. By doing so, the power of the lens can be greatly changed.

  10 and 11 show the variable focus lens of the third embodiment. In this example, a cylindrical body 519 is fixed or integrally formed on the upper surface of the transparent substrate 512, and a transparent film 513 is adhered on the cylindrical body 519 so as to close the opening, and the transparent film 513 and the transparent substrate are bonded. A transparent liquid 518 is filled in a space closed by 512 and the cylindrical body 519.

  That is, as shown in FIGS. 10 and 11, the variable focus lens is provided with a cylindrical body 519 on the upper surface of a rigid transparent substrate 512, and covers the upper opening of the cylindrical body 519 to provide elasticity. The transparent film 513 is disposed, and the peripheral edge of the transparent film 513 is bonded to the peripheral edge of the cylindrical body 519 from the back side by the adhesive 514. Then, a transparent liquid 518 is filled in a space sealed by the transparent substrate 512, the cylindrical body 519, and the transparent film 513.

  As shown in FIGS. 10 and 11, a passage (through hole) for taking in and out the transparent liquid 518 is formed in a part of the cylindrical body 519, and a tube 516 is connected to the passage. Yes. A syringe-type injector (not shown) for injecting the transparent liquid 518 is connected to the end of the tube 516.

  As described above, the transparent film 513 is bonded to the upper peripheral edge of the cylindrical body 519 by applying the adhesive 514 from the back surface. According to this bonding method, the adhesive 514 is transparent as described above. Since the transparent film 513 and the cylindrical body 519 are applied to the boundary portion (corner part) with the cylindrical body 519 at the peripheral edge of the back side of the film 513, the adhesive does not bleed out around the lens and is good. Adhesive with a good appearance. In addition, since the adhesive 514 is reliably applied to the peripheral edge of the back surface of the transparent film 513 and adheres both, sufficient adhesive strength can be obtained even if the adhesive is simply applied to the peripheral edge. Therefore, the transparent film 513 can be easily adhered.

  In this variable focus lens, the transparent film 513 expands by filling the transparent liquid 518 into the transparent film 513, and the curvature of the surface of the transparent film 513, that is, the curvature of the lens changes according to the filling amount of the transparent liquid 518. The focal length changes. At this time, since the transparent film 513 can swell or shrink so as to rise immediately from the upper peripheral edge of the cylindrical body 519, the boundary characteristics of the lens peripheral edge are good.

  Further, in the same manner as described above, this variable focus lens is coated with the adhesive 514 along the rear peripheral edge of the transparent film 513 and adheres to the upper peripheral edge of the cylindrical body 519. The transparent film 513 can be easily adhered by simply applying it to the peripheral edge of the back surface, and further, the adhesive oozes out between the transparent film on the peripheral edge of the transparent substrate as in the conventional case, and the appearance of the lens deteriorates. Thus, a variable focus lens having a good appearance can be manufactured.

  FIG. 12 shows a variable focus lens according to the fourth embodiment. In this example, a frame body 619 is bonded to the upper surface of the transparent substrate 612, a transparent film 613 is bonded onto the frame body 619, and the transparent film 613, the transparent substrate 612, and the frame body 619 are transparent in a closed space. Liquid 618 is filled.

  That is, as shown in FIG. 12, in this variable focus lens, a frame body 619 is bonded to the upper surface of a transparent substrate 612 having rigidity, and a transparent film 613 having elasticity is covered on the frame body 619. The peripheral portion of the transparent film 613 is adhered to the peripheral end portion of the frame body 619 from the back side by the adhesive 614. The frame body 619 is preferably formed in a ring shape from a synthetic resin having elasticity. The cross-sectional shape of the frame body 619 may be a normal rectangular cross section. However, when the frame body 619 is formed of an elastic synthetic resin, the frame body is formed by adhesion of the transparent film 613 or by swelling of the transparent film 613. 619 is elastically deformed into a trapezoidal shape whose upper surface is inclined as shown in FIG. 12, and the boundary characteristics of the lens periphery are improved. Then, a transparent liquid 618 is filled in a space sealed by the transparent substrate 612, the frame body 619, and the transparent film 613.

  As shown in FIG. 12, a part of the transparent substrate 612 is formed with a passage 615 (through hole) for taking in and out the transparent liquid 618, and a tube 616 is connected to the passage. A syringe type injector 7 for injecting the transparent liquid 618 is connected to the end of the tube 616.

  As described above, the transparent film 613 is bonded to the upper peripheral edge of the frame 619 by applying the adhesive 614 from the back surface. According to this bonding method, the adhesive 614 is transparent as described above. Since the transparent film 613 and the frame body 619 are applied to the boundary portion (corner portion) with the frame body 619 at the back side peripheral edge of 613, the adhesive does not bleed out around the lens and has a good appearance. Can be glued. Also, since the adhesive 614 is reliably applied to the peripheral edge of the back surface of the transparent film 613 and adheres to both, sufficient adhesive strength can be obtained even if the adhesive is simply applied to the peripheral edge. Therefore, the transparent film 613 can be easily adhered.

  In this variable focus lens, the transparent film 613 expands by filling the transparent liquid 618 into the transparent film 613, and the curvature of the surface of the transparent film 613, that is, the curvature of the lens changes according to the filling amount of the transparent liquid 618. The focal length changes. At this time, since the transparent film 613 can swell or shrink so as to rise immediately from the upper peripheral edge of the frame 619, the boundary characteristics of the lens peripheral edge are good.

  Further, in the same manner as described above, this variable focus lens is coated with the adhesive 614 along the rear peripheral edge of the transparent film 613 and adheres to the upper peripheral edge of the cylindrical body 619. The transparent film 613 can be easily adhered simply by applying it to the peripheral edge of the back surface, and further, the adhesive oozes out between the transparent film on the peripheral edge of the transparent substrate as in the conventional case and the appearance of the lens deteriorates. Thus, a variable focus lens having a good appearance can be manufactured.

  Furthermore, FIG. 13 shows a variable focus lens of the fifth embodiment. In this example, an annular frame 719 is bonded to the lower surface of the transparent film 713, a transparent substrate 712 is fitted and bonded to the inside of the frame 719, and a transparent liquid is contained in a space closed by the transparent film 713 and the transparent substrate 712. 718 is filled.

  That is, as shown in FIG. 13, the variable focus lens has an annular frame 719 bonded along the peripheral edge of the lower surface of the transparent film 713 having elasticity, and has rigidity inside the frame 719. A transparent substrate 712 is inserted and bonded. At this time, the transparent film 713 is bonded to the upper surface of the frame body 719 using an adhesive, but since the adhesive only adheres to the upper surface of the frame body 719, the adhesive does not ooze out to the surroundings, Adhesion is possible with a good appearance.

  Further, since the transparent substrate 712 is fitted inside the frame body 719 and adhered to the frame body at the outer peripheral edge portion thereof, the adhesive strength is sufficiently high, and the adhesive does not ooze out inside the transparent film 713. . Similarly to the above, the frame body 719 is preferably formed in a ring shape from a synthetic resin having elasticity, and the cross-sectional shape of the frame body 719 may be a normal rectangular cross section, but the synthetic resin having elasticity is preferable. When the frame body 719 is formed by the above, the frame body 719 is elastically deformed into a trapezoid shape whose upper surface is inclined as shown in FIG. Become. Then, a transparent liquid 718 is filled in a space sealed by the transparent substrate 712 and the transparent film 713.

  As shown in FIG. 13, a passage 715 (through hole) for taking in and out the transparent liquid 718 is formed through a part of the transparent substrate 712, and a tube 716 is connected to the passage. An injector for injecting the transparent liquid 718 is connected to the end of the tube 716.

  In this variable focus lens, the transparent film 713 expands by filling the transparent liquid 718 into the transparent film 713, and the curvature of the surface of the transparent film 713, that is, the curvature of the lens changes according to the filling amount of the transparent liquid 718. The focal length changes. At this time, the transparent film 713 swells so as to rise immediately from the upper surface of the frame body 719. However, as described above, when the frame body 719 is made of a synthetic resin having elasticity, the cross-sectional shape is rectangular. As shown in FIG. 13, it is elastically deformed into a trapezoidal shape with an inclined upper surface, and the boundary characteristics of the lens peripheral edge portion are improved.

  In the embodiment of FIGS. 12 and 13, the frame bodies 619 and 719 are formed of a synthetic resin having elasticity, but the shape is such that the upper surface of the frame body is inclined so as to be lower on the outer side and higher on the inner side. If (trapezoidal cross-sectional shape) is used, good lens boundary characteristics can be obtained even with a synthetic resin having no elasticity.

  FIG. 14 shows a cross-sectional view of an instrument using the variable focus lens of the first embodiment. This instrument is provided with a variable focus lens 20 on the front surface of the dial 21 so that the display of the dial 21 can be enlarged. That is, the varifocal lens 20 is provided with the transparent film 3 having elasticity covering the surface of the transparent substrate 2 having rigidity, as in the first embodiment. The peripheral edge is bonded by the adhesive 4. That is, the adhesive 4 is applied to the peripheral edge surface of the transparent substrate 2 and the back surface periphery of the transparent film 3, and the transparent film 3 and the transparent substrate 2 are bonded from the back surface side. A passage 5 for circulating a transparent liquid is provided in the transparent substrate 2, a tube 6 is connected to the outlet of the passage 5, and a syringe-type injector equipped with a piston is connected to the tip of the tube 6.

  Such a varifocal lens 20 is disposed so as to cover the front surface of the instrument on which the pointer 22 (fixed to the axis of the movement 24), the dial 21 and the like, which are the display surface of the instrument, is disposed. A transparent cover 23 is attached to. The syringe type injector is installed on the side of the instrument, or when the instrument is an automobile instrument, an operation knob is provided on a part of the instrument panel, and the piston of the syringe injector is moved by the operation knob. Can be linked together.

  In the same manner as described above, the transparent liquid 8 is filled between the transparent substrate 2 and the transparent film 3, and the focal length of the lens is changed by changing the filling amount of the transparent liquid 8 by a syringe type injector. The piston of the syringe-type injector can be moved, for example, in three stages according to the operation of moving the operation knob. Thereby, when a user operates the operation knob provided in a part of the instrument panel, the piston of the syringe type injector moves, and the filling amount of the transparent liquid 8 in the transparent film 3 changes, thereby The power of the variable focus lens as a convex lens is changed by changing the curvature of the transparent film.

  According to the instrument provided with such a variable focus lens 20, the variable focus lens 20 can be used as a convex lens to enlarge and display a dial or a pointer which is a display surface of the instrument, and further linked to an operation knob. By adjusting the filling amount of the transparent liquid 8 with a syringe-type injector, the power of the variable focus lens 20 is adjusted in accordance with the visual acuity of the person viewing the instrument, and the enlarged display of the instrument is performed in a state that is easy for the viewer to see. be able to.

  15 and 16 show another embodiment of the instrument using a variable focus lens. A variable focus lens 80 is disposed on a part of the front face of the instrument, that is, on the front face of the trip meter 34 in the speed meter so that the trip meter 34 can be enlarged and visually recognized.

  That is, the variable focus lens 80 is disposed so that a frame body 819 is bonded to the upper surface of a rigid transparent substrate 812, and an elastic transparent film 813 is covered on the frame body 819. The peripheral portion of 813 is bonded to the peripheral end portion of the frame body 819 from the back side by an adhesive 814. The transparent substrate 812 also serves as the front glass (transparent plate) of the trip meter 34. On the transparent substrate 812 as the front glass of the meter, the peripheral portion of the transparent film 813 has the frame body 819 as described above. Is glued through. The frame body 819 is formed in a ring shape from a synthetic resin having elasticity in the same manner as described above, and the cross-sectional shape of the frame body 819 can be a rectangle or a trapezoid whose upper surface is inclined.

  Then, a transparent liquid 818 is filled into a space sealed with the transparent substrate 812, the frame body 819, and the transparent film 813. A transparent substrate 812 is provided with a passage 815 for circulating a transparent liquid, a tube 816 is connected to the outlet of the passage 815, and a syringe type syringe 7 is connected to the tip of the tube 816. The front surface of the speed meter provided with the trip meter 34 is covered with a transparent cover 33, and the operation part of the syringe-type injector 7 projects forward from the transparent cover 33 as shown in FIG.

  Therefore, when the user presses the operating portion (the end portion of the piston) of the injector 7 located on the front surface of the meter, the transparent liquid 818 is injected into the lens, and thereby the transparent film 813 swells, and the convex lens. The power of the variable focus lens can be changed. As described above, the variable focus lens 80 is provided in a part of the instrument, particularly a part where the display characters are relatively small, so that the magnified lens 80 can be viewed in an enlarged manner. You can easily see the small letters on the instrument with a simple operation by simply pressing the part.

  FIG. 18 and FIG. 19 show an embodiment in which display portions of various displays such as electric products can be viewed with magnification using a variable focus lens. The electric product in this example is, for example, an electric refrigerator, and a variable focus lens 90 is disposed on the front surface of a warning display unit 44 provided on a wall in the refrigerator, and the warning display unit 44 is enlarged. To make it visible. The warning display unit 44 is provided adjacent to the liquid crystal display unit and displays printed characters.

  In the same manner as described above, the varifocal lens 90 is arranged such that a frame body 919 is bonded to the upper surface of the transparent substrate 912 having rigidity, and an elastic transparent film 913 is covered on the frame body 919. The peripheral edge of the transparent film 913 is bonded to the peripheral edge of the frame 919 from the back side by the adhesive 914. The transparent substrate 912 is bonded onto the warning display portion 44 of the electric product, and the peripheral portion of the transparent film 913 is bonded onto the transparent substrate 912 through the frame body 919 as described above. The frame body 919 is formed in a ring shape from an elastic synthetic resin as described above, and the cross-sectional shape of the frame body 919 can be a rectangle or a trapezoid whose upper surface is inclined.

  A transparent liquid 918 is filled in a space sealed by the transparent substrate 912, the frame body 919, and the transparent film 913. A transparent substrate 912 is provided with a passage 915 for circulating a transparent liquid, a tube 916 is connected to the outlet of the passage 915, and a syringe type injector 7 having a piston is connected to the tip of the tube 916. The front surface of the warning display section 44 of the electrical product is covered with a transparent cover 43 together with the variable focus lens 90, and the operation section of the syringe-type injector 7 is disposed next to the transparent cover 43. A coil spring is externally fitted to the piston rod of the syringe-type injector 7, and the operation portion at the tip of the piston rod is pushed down against the spring force of the coil spring.

  Accordingly, when the user pushes the operation portion of the injector 7 located adjacent to the warning display portion 44 against the spring force of the coil spring, the transparent liquid 918 is injected into the lens, and thereby the transparent film 913 bulges, the power of the variable focus lens as a convex lens changes, and a small character on the warning display unit 44 is enlarged and displayed. As a result, even if the text of the text described in the warning display section is small, the warning text can be enlarged and viewed through the variable focus lens 90, whereby a person with weak vision sees the warning display. In this case, the characters can be enlarged and viewed easily by a simple operation by simply pressing the operation unit.

  If the hand of the syringe-type injector 7 is released, the piston of the injector returns to the original position by the spring force of the coil spring, and the power of the variable focus lens 90 returns to the normal time. Only when it is desired to see the part 44, the operation part of the injector 7 is pushed to enlarge it, and after it is seen, the original non-expanded state is restored, so that the warning display part 44 can be kept inconspicuous at normal times. .

  In the above-described embodiment, an example in which a variable focus lens is used for an instrument or a household electric appliance has been described. However, the variable focus lens having the above configuration may be used as a display unit of a vending machine (for example, a display such as a liquid crystal display device). Or a display portion on which characters or the like are printed), and the display portion can be enlarged through a variable focus lens. In this case, when a variable focus lens is attached to the front surface of the transparent plate in the display unit of the display device of the vending machine and a person with low vision sees the display unit, the injector 7 is operated to change the variable focus as a convex lens. Increase the power of the lens so that it can be magnified. When a person with weak vision has finished watching it, return the operation unit to the original position and lower the power of the variable focus lens. You can see the display.

  Moreover, although the syringe type injector was used in the said embodiment, the filling amount of a transparent liquid can also be adjusted using a bellows type injector or a syringe type injector.

  Further, in these syringe type injectors, bellows type injectors, or syringe type injectors, for example, a biasing means such as a coil spring can be attached to the piston. In this case, when the operation button is pushed and the piston is moved in one direction against the spring force of the coil spring, the liquid is filled with the liquid and the frequency increases, and when the operation button is released, the piston is automatically Can return to the original position, and the filling amount of the transparent liquid can be reduced to return the power to the normal state.

  Further, in the above embodiment, the shape of the variable focus lens is mainly circular, but it may be elliptical or rectangular with rounded corners.

  As described above, according to the variable focus lens of the present invention, since the transparent film and the transparent substrate are bonded to each other by attaching the adhesive to the peripheral edge surface of the transparent substrate and the back surface peripheral portion of the transparent film, Compared with the case where a transparent film is bonded to the front peripheral edge of the transparent substrate, the rising edge of the transparent film can be improved when the peripheral edge of the transparent film bulges, thereby improving the boundary characteristics at the lens peripheral edge. . Further, since the transparent film is bonded to the peripheral edge of the transparent substrate, the transparent film can be expanded in a wide range, the variable range of the lens power can be increased, and the adhesive is used for the transparent substrate. Since the peripheral edge surface and the back surface peripheral edge of the transparent film are bonded, the transparent film can be bonded with sufficient adhesive strength. In addition, since the adhesive is applied to the peripheral edge of the back surface of the transparent film, the adhesive layer oozes to the peripheral edge of the lens like a variable focus lens that adheres the transparent film to the front peripheral edge of the conventional transparent substrate. The deterioration of the appearance of the lens peripheral edge due to the adhesive can be eliminated.

It is sectional drawing of the variable focus lens of 1st Embodiment of this invention. It is a bottom view of the variable focus lens. It is sectional drawing of the variable focus lens of other embodiment. It is sectional drawing of the variable focus lens of other embodiment. It is sectional drawing of the variable focus lens of 2nd Embodiment of this invention. It is sectional drawing of the variable focus lens of other embodiment. It is sectional drawing of the variable focus lens of other embodiment. It is sectional drawing of the variable focus lens of another embodiment. It is sectional drawing of the variable focus lens of another embodiment. It is sectional drawing of the variable focus lens of 3rd Embodiment of this invention. It is a bottom view of the variable focus lens. It is sectional drawing of the variable focus lens of 4th Embodiment of this invention. It is sectional drawing of the variable focus lens of 5th Embodiment of this invention. It is sectional drawing of the instrument which uses the variable focus lens of this invention. It is a front view of the other example of the instrument using the variable focus lens of this invention. It is sectional drawing of the variable focus lens. It is a front view of the warning display part of the electric product using the variable focus lens of this invention. It is sectional drawing of the variable focus lens.

Explanation of symbols

2-transparent substrate 3-transparent film 4-adhesive 5-passage 6-tube 7-syringe injector 8-transparent liquid

Claims (15)

  A transparent film having elasticity is disposed so as to cover the surface of the transparent substrate having rigidity, and a peripheral portion of the transparent substrate and the transparent film are adhered by an adhesive, and the transparent substrate and the transparent film are interposed between the transparent substrate and the transparent film. A variable focus lens filled with a transparent liquid, wherein an adhesive is applied to a peripheral edge surface of the transparent substrate and a back surface peripheral portion of the transparent film so that the transparent film and the transparent substrate are adhered to each other, and the transparent liquid flows through the transparent substrate. A variable-focus lens characterized in that a passage for the use is provided.   2. A tube is connected to an outlet of a passage provided in the transparent substrate, an injector is connected to a tip of the tube, and a focal length is changed by changing a filling amount of the transparent liquid by the injector. The variable focus lens described.   The variable focus lens according to claim 1, wherein the transparent film is bonded to both front and back surfaces of the transparent substrate, and a transparent liquid is filled between the front and back surfaces of the transparent substrate and the transparent films on both sides.   The variable focus lens according to claim 1, wherein the transparent substrate is formed of a flat transparent plate.   The variable focus lens according to claim 1, wherein the transparent substrate has a convex surface bulging convexly toward the transparent film.   A variable focus lens in which a transparent film having elasticity covering the openings on both the front and back surfaces of a cylindrical body is bonded, and the cylindrical body is filled with a transparent liquid inside the transparent films. The transparent film and the cylindrical body are bonded to each other by attaching an adhesive to the outer peripheral surface of the transparent film and the peripheral edge of the back surface of the transparent film, and a passage for circulating a transparent liquid is provided in the cylindrical body. Variable focus lens.   A cylindrical body is bonded onto a rigid transparent substrate, an elastic transparent film is disposed to cover the opening of the cylindrical body, and the peripheral edge of the cylindrical body and the transparent film are bonded. A variable focus lens that is adhered by an agent and filled with a transparent liquid inside the transparent substrate, the transparent film, and the cylindrical body, on the outer peripheral surface of the cylindrical body and the peripheral edge of the back surface of the transparent film A variable focus lens, characterized in that an adhesive is applied to bond the transparent film and the cylindrical body, and a transparent liquid passage is provided in the transparent substrate or the cylindrical body.   A transparent film having elasticity is disposed to cover the surface of the transparent substrate having rigidity, and the transparent substrate and a peripheral portion of the transparent film are bonded by an adhesive via a frame, and the transparent substrate and the transparent substrate are bonded. A variable focus lens filled with a transparent liquid between the film and the frame, the frame is bonded to the upper surface of the transparent substrate, and an adhesive is attached to the peripheral edge of the frame and the back surface of the transparent film. A variable focus lens, wherein the transparent film and the frame are bonded to each other, and a transparent liquid passage is provided in the transparent substrate.   A transparent film having elasticity is disposed to cover the surface of the transparent substrate having rigidity, and the transparent substrate and a peripheral portion of the transparent film are bonded by an adhesive via a frame, and the transparent substrate and the transparent substrate are bonded. A variable focus lens filled with a transparent liquid between the film and the transparent substrate is inserted and bonded to the inside of the frame, and an adhesive is attached to the upper surface of the frame to A variable focus lens, characterized in that a peripheral edge is bonded onto the frame body, and a transparent liquid passage is provided in a transparent substrate.   An instrument having a variable focus lens disposed on the front surface of an instrument panel, wherein the variable focus lens is provided with a transparent film having elasticity covering the surface of a transparent substrate having rigidity, and the transparent substrate and the The peripheral part of the transparent film is bonded with an adhesive, and a transparent liquid is filled between the transparent substrate and the transparent film, and the adhesive is applied to the peripheral edge of the transparent substrate and the back peripheral part of the transparent film. The transparent film and the transparent substrate are attached to each other, a transparent liquid passage is provided in the transparent substrate, a tube is connected to the outlet of the passage, and an injector is connected to the tip of the tube. An instrument characterized in that the focal length of the variable focus lens is changed by changing the filling amount of the transparent liquid.   An instrument having a variable focus lens disposed on the front surface of an instrument panel, wherein the variable focus lens is provided with a transparent film having elasticity covering the surface of a transparent substrate having rigidity, and the transparent substrate and the A peripheral portion of the transparent film is bonded through a frame, and a transparent liquid is filled between the transparent substrate and the transparent film, and the frame is bonded to the upper surface of the transparent substrate. The transparent film and the frame are bonded to each other by attaching an adhesive to the outer peripheral edge of the transparent film and the rear peripheral edge of the transparent film, and a transparent liquid passage is provided in the transparent substrate, and a tube is connected to the outlet of the passage. An instrument is connected to the tip of the tube, and the focal length of the variable focus lens is changed by changing the filling amount of the transparent liquid by the injector.   An instrument having a variable focus lens disposed on the front surface of an instrument panel, wherein the variable focus lens is provided with a transparent film having elasticity covering the surface of a transparent substrate having rigidity, and the transparent substrate and the A peripheral portion of the transparent film is bonded through a frame, and a transparent liquid is filled between the transparent substrate and the transparent film, and the frame is bonded to the upper surface of the transparent substrate. The transparent film and the frame are bonded to each other by attaching an adhesive to the upper surface of the tube, a transparent liquid passage is provided in the transparent substrate, a tube is connected to the outlet of the passage, and an injector is connected to the tip of the tube And changing the focal length of the varifocal lens by changing the filling amount of the transparent liquid by the injector.   A display having a variable focus lens disposed in front of a display unit, wherein the variable focus lens is provided with a transparent film having elasticity covering a surface of a transparent substrate having rigidity, and the transparent substrate The peripheral part of the transparent film is bonded with an adhesive, and a transparent liquid is filled between the transparent substrate and the transparent film, and the adhesive is formed on the peripheral edge surface of the transparent substrate and the back surface peripheral part of the transparent film. The transparent film and the transparent substrate are attached to each other, a passage for circulating a transparent liquid is provided in the transparent substrate, a tube is connected to the outlet of the passage, and an injector is connected to the tip of the tube. And changing the focal length of the variable focus lens by changing the filling amount of the transparent liquid.   A display having a variable focus lens disposed in front of a display unit, wherein the variable focus lens is provided with a transparent film having elasticity covering a surface of a transparent substrate having rigidity, and the transparent substrate A peripheral portion of the transparent film is bonded through a frame, and a transparent liquid is filled between the transparent substrate and the transparent film. The frame is bonded to the upper surface of the transparent substrate, and the frame Adhesive is applied to the outer peripheral edge of the body and the rear peripheral edge of the transparent film to bond the transparent film and the frame, and a transparent liquid passage is provided in the transparent substrate, and a tube is provided at the outlet of the passage. A display comprising: an injector connected to a distal end of a tube, and changing a focal length of the variable focus lens by changing a filling amount of the transparent liquid by the injector. A display having a variable focus lens disposed in front of a display unit, wherein the variable focus lens is provided with a transparent film having elasticity covering a surface of a transparent substrate having rigidity, and the transparent substrate A peripheral portion of the transparent film is bonded via a frame, and a transparent liquid is filled between the transparent substrate and the transparent film. The frame is bonded to the upper surface of the transparent substrate, and the frame An adhesive is attached to the upper surface of the body, the transparent film and the frame are bonded, a transparent liquid passage is provided on the transparent substrate, a tube is connected to the outlet of the passage, and an injector is provided at the tip of the tube. A display device connected, wherein the focal length of the varifocal lens is changed by changing the filling amount of the transparent liquid by the injector.

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