KR100505192B1 - Composite lens for processing a plurality of light signals - Google Patents

Abstract

Disclosed are a composite lens for focusing and refracting a plurality of optical signals effectively without errors. The composite lens may include: a focusing lens unit including a plurality of convex lenses positioned on a path through which a plurality of lights travel, respectively, to focus the plurality of lights; And a refractive lens unit positioned at a rear surface of the focusing lens unit and refracting a plurality of lights focused at the focusing lens unit.

Description

Composite lens for processing a multiple of light signals

The present invention relates to a composite lens for processing a plurality of optical signals, and more particularly to a composite lens for focusing and refracting a plurality of optical signals effectively without error.

The substance inspection method which irradiates light to a specific test object, analyzes the optical signal reflected by the test object, and grasp | checks the state of a test object is well known. Such an inspection method may use a single optical signal or multiple optical signals depending on the inspection purpose. 1 is a view for explaining the principle of the measurement of an optometry (Refractometer) for measuring the optical power by using a plurality of optical signals. As shown in FIG. 1, a conventional refractor has a chart image generator 20 for performing a fogging process to fix the eye of the eye and blur the focus, and the retina 3 of the eye 1 Measurement light source 10 for scanning the refractive power measurement light to the light, the measurement light detector 12 to which the measurement light reflected from the retina 3 is incident, and the retina 3 of the eye 1 And a photodetector 40 for detecting the chart image reflected from the image. Referring to the operation of the refractive index meter, the visible light emitted from the lamp 22 of the chart image generation unit 20 passes through the chart 24 to form an image, the image formed in the chart 24 is The retina 3 of the eye to be examined 1 through the first relay lens 25, the reflection mirror 26, the second and third relay lenses 27 and 28, and the first and second beam splitter mirrors 35 and 36. ) Form a chart image. At this time, the image of the eye reflected from the cornea 2 is passed to the photodetector 40 through the first and second beam splitter mirrors 35 and 36, the third relay lens 28, and the fourth relay lens 37. Incident. After the image of the eye is observed by the photodetector 40 to match the optical axis of the eye and the optometry, the first relay lens 25 is moved to focus on the target of the eye 1. As described above, in the state in which the eye 1 is in focus, the operation process of moving the position of the first relay lens 25 to make the eye 1 out of focus is performed. Through such a clouding process, the lens of the eye to be examined 1 is in a relaxed state, and the refractive power is measured in this state.

After performing the operation process as described above, the refractive power measurement light is emitted from the measurement light source (10). The measurement light emitted from the measurement light source 10 is focused in the fifth relay lens 11, passes through the center of the hole mirror 19, and passes through the objective lens 34 and the first beam splitter mirror 35. It enters into the retina 3 of (1). The measurement light reflected from the retina 3 is reflected by the hole mirror 19 through the first beam splitter mirror 35, separated into a plurality of measurement light in the hole plate 13, and then prism ( 50 is refracted and focused on a plano-convex lens 14 and is incident on the photodetector 15. Since the advancing direction of the plurality of measurement lights separated from the hole plate 13 depends on the refractive power of the eye 1, the refractive power of the eye 1 using the positions of the plurality of measurement light formed in the photodetector 15. Can be calculated.

As such, the light divided into a plurality of optical signals in the hall plate 13 is appropriately focused according to the size and position of the photodetector 15, the distance between the photodetector 15 and the hole plate 13, the required resolution, and the like. And refracted to enter the photodetector 15. In particular, the photodetector 15 is made of a charge coupled device (CCD), and an expensive 1 / 2-inch CCD may be used as the photodetector 15. Since a small CCD is used, the divided optical signal must be accurately focused and refracted to form a clear image on the small photodetector 15. In the conventional refractive power meter shown in FIG. 1, a prism 50 and a plano-convex lens 14 are used to refract and focus a divided optical signal.

FIG. 2 illustrates a conventional optical signal focusing and refraction method, in which a prism and a convex lens are used for focusing and refracting an optical signal. As illustrated in FIG. 2, a target pinhole or a hole is illustrated. The optical signal divided by the plate 13 may be refracted by the prism 50, focused by the convex lens 52, and incident on the photodetector 15. 3 shows that when the photodetector 15 and the hole plate 13 are not located on the same optical axis, the optical signal divided by the hole plate 13 is first focused onto the convex lens 60, and the inclined prism 62 is shown. Shows a case in which the light is refracted in a specific direction and incident on the photodetector 15.

As described above, in general, a convex lens and / or prism is properly combined to focus and refraction the divided optical signal. However, the converging and / or refraction method of the optical signal using the convex lens and / or prism error a plurality of optical signals. Not only does it not effectively refract and focus, but there must be sufficient distance between the photodetector 15 and the hole plate 13, and a large number of optical components must be placed between the photodetector 15 and the hole plate 13. Therefore, there is a disadvantage that the mechanical complexity.

Accordingly, an object of the present invention is to provide a composite lens for effectively focusing and refracting a plurality of optical signals without errors.

Another object of the present invention is to provide a composite lens capable of reducing the number of optical components for focusing and refracting a plurality of optical signals.

It is still another object of the present invention to provide a composite lens capable of reducing the spatial distance required for focusing and refracting a plurality of optical signals.

In order to achieve the above object, the present invention is a focusing lens unit comprising a plurality of convex lenses, each of which is located on a path through which a plurality of lights proceed, focusing the plurality of lights respectively; And a refractive lens unit positioned at a rear surface of the focusing lens unit and refracting a plurality of lights focused at the focusing lens unit.

Here, adjacent edges of the plurality of convex lenses overlap each other, and the number of the plurality of convex lenses may be 3 to 10. The refractive lens unit may be one convex lens that is convex in the opposite direction to the convex lens, or may be a cone-shaped prism protruding in the opposite direction to the convex lens.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. For convenience of description, the same reference numerals are assigned to members performing the same function.

4A and 4B are plan and sectional views taken on line A-A ', respectively, of the composite lens according to the exemplary embodiment of the present invention. As shown in FIGS. 4A and 4B, the composite lens 70 according to the exemplary embodiment of the present invention is located in a path through which a plurality of optical signals travel, and includes a plurality of convex lenses each focusing the plurality of optical signals. A focusing lens unit 72 composed of 72a, 72b, 72c, and 72d is formed on the front surface of the composite lens 70, and the refractive lens unit 74 that refracts a plurality of lights focused at the focusing lens unit 72. ) Is formed on the rear surface of the compound lens 70.

Here, the plurality of optical signals are incident only to the center of the plurality of convex lenses 72a, 72b, 72c, and 72d, so that adjacent edges of the convex lenses 72a, 72b, 72c, and 72d overlap each other. It is preferable because a plurality of convex lenses 72a, 72b, 72c, and 72d can be effectively disposed on the front surface of the composite lens 70. The overlapping degree of the convex lenses 72a, 72b, 72c, and 72d depends on the thickness of the signal light incident on the composite lens 70, that is, the resolution, and when the diameter of the signal light is small, the convex lens 72a , 72b, 72c, 72d) can be increased, and when the diameter of the signal light is large, the degree of overlap of the convex lenses 72a, 72b, 72c, 72d should be reduced. The number of convex lenses constituting the focusing lens unit 72 is not necessarily four, and the number can be set according to the number of optical signals including information such as various measurement information, preferably three to 10. If the number of the convex lenses constituting the converging lens unit 72 is less than three, there is a fear that the optical signal does not sufficiently contain the measurement information. If the number of the convex lenses exceeds 10, the configuration of the composite lens 70 becomes excessively complicated. There are disadvantages. In addition, as shown in FIG. 4B, the refractive lens unit 74 may be formed of one convex lens that is convex in the opposite direction to the convex lenses 72a, 72b, 72c, and 72d. As described above, the prism 74 may be formed in a cone shape projecting in the opposite direction to the convex lenses 72a, 72b, 72c, and 72d. The curvature of the plurality of convex lenses 72a, 72b, 72c, and 72d and the refractive lens unit 74 is determined by the structure of the device in which the composite lens 70 according to the present invention is used, the size of the photodetector, and the photodetector. It can select suitably according to distance, required focusing and refraction degree.

5A and 5B are plan and sectional views taken on line A-A ', respectively, of a composite lens according to another embodiment of the present invention. In the compound lens 70 shown in FIGS. 5A and 5B, six convex lenses 76a, 76b, 76c, 76d, 76e, and 76f formed so as not to overlap each independently form the focusing lens unit 76. On the back of the 70, a refractive lens portion 78 for refracting a plurality of light focused in the focusing lens portion 76 is formed.

In this way, focusing lens units 72 and 76 are positioned on the front surface and refractive lens units 74 and 78 on the rear surface, thereby precisely focusing and refracting a plurality of optical signals that vary sensitively depending on a measurement object. You can. That is, in the case of the measurement of visual power, the light reflected from the retina is divided by using the hole plate 13, and then focused and refracted by the composite lens 70 of the present invention, so that the divided optical signal has sufficient resolution. Can be precisely incident on the miniature photodetector 15. The composite lens according to the present invention can be widely applied to various optical devices and inspection equipment that need to focus and refract a plurality of optical signals, for example, an optical refractive power meter, a lens meter, a lens analyzer, a waveform analyzer, and the like.

As described above, the composite lens according to the present invention can not only effectively focus and refract a plurality of optical signals without errors, but also reduce the number of optical components for focusing and refracting optical signals, By reducing the spatial distance required for focusing and refracting, it is possible to effectively improve the mechanical configuration of various inspection equipment.

1 is a view for explaining the measuring principle of the optometry for measuring the refractive power by using a plurality of optical signals.

2 is a view illustrating a case of using a target pinhole for separating and selecting an optical signal, a prism and a convex lens for focusing and refracting the separated optical signal, as a conventional optical signal focusing and refraction method.

3 is a view showing a case in which an optical signal is focused, refracted, and incident on the photodetector when the photodetector is not located on the optical axis;

4A and 4B are plan and sectional views taken on line A-A ', respectively, of the composite lens according to one embodiment of the present invention;

4C is a cross-sectional view of a compound lens according to another embodiment of the present invention.

5A and 5B are plan and sectional views taken along line A-A ', respectively, of a composite lens according to another embodiment of the present invention;

Claims (6)

A focusing lens unit including 3 to 10 convex lenses positioned on a path through which 3 to 10 optical signals including measurement information to be inspected progress, respectively for focusing the optical signals; And Located in the rear of the focusing lens unit, a composite lens comprising a refractive lens unit for refracting 3 to 10 optical signals focused in the focusing lens unit. The compound lens of claim 1, wherein adjacent edges of the plurality of convex lenses overlap each other. delete The composite lens of claim 1, wherein the refractive lens unit is formed of one convex lens that is convex in a direction opposite to the convex lens. The composite lens of claim 1, wherein the refractive lens unit is formed of a cone-shaped prism protruding in a direction opposite to the convex lens. The composite lens of claim 1, wherein the plurality of convex lenses do not overlap each other, and are formed independently of each other.