KR20200076330A - Pico size projector with the projection lens and focus control method - Google Patents

Abstract

The present invention relates to a pico-size projector having a projection lens assembly and a focusing adjusting method of the projection lens assembly. In the present invention, as the pico-size projector having the projection lens assembly mounted between an engine base and an engine cover to move linearly within a predetermined range in a projection direction of light, the pico-size projector including an eccentric pin rotating screw formed to be exposed to an upper portion of the engine cover and adjusting a linear position of the projection lens assembly is disclosed. By the pico-size projector having the projection lens assembly and the focusing adjusting method of the projection lens assembly according to the present invention, focusing of a projection lens can be adjusted by using tools such as a screwdriver at an upper portion and by using an eccentric pin, thereby adjusting the focusing more easily than a projection lens assembly of a conventional pico-size projector.

Description

PICO SIZE PROJECTOR WITH PROJECTIVE LENS COMBINATION AND FOCUSING CONTROL METHOD OF PROJECTION LENS COMBINATION {PICO SIZE PROJECTOR WITH THE PROJECTION LENS AND FOCUS CONTROL METHOD}

The present invention relates to a pico size projector having a projection lens assembly and a method of adjusting focusing of the projection lens combination, and more specifically, a pico size having a projection lens assembly that can easily adjust the focusing of the projection lens using an eccentric axis. The present invention relates to a method of adjusting focusing of a projector and a projection lens combination.

To develop a portable small laser projector smaller than the size of a palm, or to commercialize a projector sized enough to be embedded in a laptop, etc., we develop a small, low-power projector (this is commonly called'pico-sized projector' in the market). shall. For convenience, a pico size projector is defined as a projector having a diameter of a projection lens smaller than that of a thumbnail. In order to manufacture a pico-sized projector, a light source of excellent size and low power consumption is required. As the most suitable light source for such a low-power projector, a laser light source or an electroluminescent device (LED) is used. Recently, the use of a laser light source advantageous in terms of luminance is gradually expanding.

A pico-sized laser projector using a laser light source consists of a laser light source, an optical modulator, and a projection lens. In practice, it has a complicated structure including an optical lens for removing the speckle, but is described in a simple configuration for convenience of explanation. The laser light source is a module that irradiates an R light source, a G light source, and a B light source composed of a laser, and the optical modulator is a module that selectively turns on/off an incident laser light source according to an image source input from the outside to form an image, The projection lens is a module that enlarges and projects an image formed in the optical modulator. As the optical modulator, a transmissive and reflective liquid crystal display (LCD), a digital micromirror device (DMD), or liquid crystal on silicon (LCoS) is mainly used.

A pico-sized projector using a laser light source is used as a portable device, and is used while expanding an image formed from an optical modulator from a size of about 17 inches to a size of about 70 inches. Such a pico-sized projector is shipped after the optical system is set to match the focusing in the manufacturing process and after quality inspection. In particular, a configuration that provides an important role for focusing is a portion of the projection lens that is focused near/far along the distance between the lenses. 1 is a perspective view showing a partial configuration including a projection lens of a conventional pico size projector. The projection lens of the conventional pico-sized projector is composed of a first barrel 51 and a second barrel 52 that are coupled by mutually screwing, and the combined barrel is installed to be fixed to the barrel. The first barrel 51 is usually provided with one lens, and the second barrel 52 is provided with a plurality of lenses. When the operator rotates the first barrel 51 clockwise or counterclockwise by hand, the focusing is changed because the first barrel 51 moves away from or closer to the second barrel 55 as indicated by a vertical line on the drawing. . When the operator repeats this operation and the position of the first barrel 51 where focusing is matched is stopped, further rotation is stopped, and at least four adhesive portions of the screw between the first barrel 51 and the second barrel 52 are adhesive. It is fixed by bonding with.

However, this work is not easy to find the correct focusing position by rotating the first barrel by hand because the size of the first barrel of the pico size projector is smaller than the thumb of the operator. It was often difficult for the operator to release the hand without touching the first barrel, and the focusing was wrong even when a small contact occurred when the hand was separated from the first barrel. In addition, after the operator releases the first barrel without touching the first barrel in the state in which the focusing is matched, as described above, the screw connection portion between the first barrel and the second barrel is fixed with at least four places, while the adhesive is cured. As it condensed, there was a problem of changing focusing.

Korean Patent Publication No. 10-2016-0019798 (published on February 22, 2016)

The present invention is to solve the above problems, to provide a pico-sized projector having a projection lens assembly capable of elaborately assembling the focusing of the projection lens without using a worker's hand, and a method of adjusting the focusing of the projection lens assembly Aim.

The object of the present invention is a pico-sized projector having a projection lens assembly mounted between the engine base and the engine cover so as to move linearly within a certain range along the projection direction of light, and is formed to be exposed on the top of the engine cover, and projecting It can be achieved by a pico-sized projector characterized in that it comprises an eccentric pin rotating screw for adjusting the position on the straight line of the lens assembly.

Preferably, the coupling through-hole provided at the corresponding position of the eccentric shaft linear movement groove and the engine cover corresponding to the center of the eccentric shaft linear movement groove and the eccentric shaft linear movement groove formed in a straight shape on the projection lens assembly in the direction perpendicular to the projection direction of the light. It is preferable to include the eccentric pin rotation screw provided in the hole and the coupling through hole and provided with a driver groove at the top and an eccentric shaft formed at a position off-center at the bottom.

More preferably, the projection lens assembly is composed of an integrally formed barrel, and the eccentric axis linear movement groove is provided on the upper portion of the barrel.

The left and right sides of the barrel are provided with protruding guides which are protruded at a predetermined length in a direction perpendicular to the direction in which light is projected from the projection lens at positions symmetrical to each other, and the engine base is provided with guide rails supporting the protruding guides from the bottom. It is equipped so that the barrel can move smoothly on the engine base.

Another object of the present invention is a method for adjusting focusing of a projection lens assembly in a pico size projector having a projection lens assembly mounted between the engine base and the engine cover so as to move linearly within a certain range along the projection direction of light. In the above, the first step of mounting the projection lens coupling between the engine base and the engine cover, the second step of rotating the eccentric pin rotating screw provided to be exposed outside the engine cover, and using the rotational force of the eccentric pin rotating screw It can also be achieved by a method of adjusting the focusing of the projection lens assembly, comprising a third step of adjusting the focusing by moving the projection lens assembly in the projection direction of light and a fourth step of fixing the eccentric pin rotating screw with an adhesive. Do.

Since the projection lens combination according to the present invention can adjust the focusing of the projection lens by using a tool such as a screwdriver from the top using an eccentric pin, it is easier to adjust the focusing than the projection lens combination of a conventional pico size projector. After focusing, which had been a problem in the projection lens combination of the size projector, it became possible to solve the problem that the focusing was disturbed by touching the first barrel as soon as the worker was released.

In addition, in the case of the conventional pico-sized projector, a plurality of positions of the screw coupling portion between the first barrel and the second barrel were fixed with an adhesive, but when the adhesive hardened, there was a problem in that focusing was scattered due to a difference in stress. However, the projection lens combination according to the present invention is able to solve the problem of scattering focusing because the adhesive is evenly applied around the eccentric pin and fixed by using a UV light source as a whole.

1 is a perspective view showing a partial configuration including a projection lens of a conventional pico size projector.
2 is a combined perspective view of a pico projector including a projection lens as an embodiment according to the present invention.
3 is an exploded perspective view of a pico projector including a projection lens as an embodiment according to the present invention.
Figure 4 is a perspective view of the state with the engine cover removed in the state of Figure 2;
5 is a perspective view of a projection lens assembly and an eccentric pin rotation screw for showing the moving distance of the projection lens assembly of the pico projector according to the present invention.
6 is a perspective view of an eccentric pin rotating screw according to the present invention.

The terms used in the present invention are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, the terms "include" or "have" are intended to indicate the presence of features, numbers, steps, actions, components, parts or combinations thereof described in the specification, one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

In addition, in the present specification, "on or above" means that it is located above or below the target part, and does not necessarily mean that it is located on the upper side based on the direction of gravity. Also, when a portion of an area, plate, or the like is said to be "on or above" another portion, this means that another portion in the middle, as well as if it is in contact or spaced "on or above" another portion. Also included.

In addition, in this specification, when one component is referred to as "connected" or "connected" with another component, the one component may be directly connected to the other component, or may be directly connected, but in particular It should be understood that, as long as there is no objection to the contrary, it may or may be connected via another component in the middle.

Further, in this specification, terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from other components.

Hereinafter, exemplary embodiments, advantages, and features of the present invention will be described in detail with reference to the accompanying drawings.

2 is a combined perspective view of a pico projector including a projection lens according to the present invention, FIG. 3 is an exploded perspective view, and FIG. 4 is a perspective view of the engine cover removed in the state of FIG. 2. 2 and 3, the pico projector comprises a cooling unit 10, an engine base 20, an engine cover 30, a projection lens assembly 50, and an eccentric pin rotating screw 80. The optical element including the light source and the mirror mounted between the engine base 20 and the engine cover 30 is not illustrated because the present invention is a configuration irrelevant to the description. The projection lens assembly 50 is composed of one barrel. That is, in the prior art, the barrel was formed to be separated into two barrels, and the first barrel and the second barrel were screwed together. In the prior art, the focusing was adjusted by rotating the first barrel to adjust the distance from the second barrel. In the present invention, the projection lens assembly 50 formed of one barrel is seated in a space provided between the engine base 20 and the engine cover 30 in a state where the assembly is completed, and the stop ring 57 is a projection lens assembly ( In addition to the role of the stopper of 50), it provides a function to remove unnecessary light.

Eccentric shaft linear movement grooves 59 are installed on the upper portion of the projection lens 50, and protruding guides 61 are formed on both sides of the projection lens assembly 50 to protrude to the outside. The engine base 20 is provided with a guide rail 71 that supports the protruding guide 61 and is provided as a linear movement path. The engine cover 30 corresponding to the eccentric shaft linear movement groove 59 is provided with a coupling through hole 31, and an eccentric pin rotation screw is coupled to the coupling through hole 31. When the projection lens assembly 50 is rotated between the engine base 20 and the combined combination of the engine cover 30 and the eccentric pin rotating screw 80 is rotated, the eccentric axis is formed on the projection lens assembly 50. As the pin provided under the eccentric pin rotation screw 80 in the X-axis direction along the moving groove 59 moves within a certain range, the projection lens assembly 50 is moved forward and backward within a certain range on the Z-axis, thereby adjusting focusing. You can do it. That is, in the case of the prior art, the focusing was adjusted by rotating the screw coupling portion formed between the first barrel and the second barrel, but in the present invention, the projection lens is used while using the barrel (projection lens combination) integrally formed without separating the barrel. The focusing is controlled while the coupling body 50 is moved forward and backward on the Z axis as a whole.

5 is a perspective view of the projection lens assembly and the eccentric pin rotation screw for showing the moving distance of the projection lens assembly of the pico projector according to the present invention. 5, an eccentric shaft provided to deviate from the center is formed at the lower portion of the eccentric pin rotating screw 80, and when the eccentric pin rotating screw 80 is rotated, the eccentric pin has a circle 87 drawn on the top. Therefore, it moves on the Z and X axis planes. By rotating the eccentric pin rotation screw 80, the eccentric pin is able to move the projection lens assembly 50 in the Z-axis direction while advancing and reversing in the Z-axis direction along the eccentric axis linear movement groove 59.

6 is a perspective view of an eccentric pin rotating screw according to the present invention. The eccentric pin rotation screw 80 is provided with a driver groove 81 at the upper portion, and an eccentric shaft 83 provided at an offset from the central axis is provided at the lower portion.

Hereinafter, a procedure for adjusting the focusing of the projection lens in the manufacturing process of the pico projector according to the present invention will be described. After the assembled projection lens assembly 50 is seated on the engine base 20, the engine cover 30 is covered. An eccentric pin rotation screw 80 is provided in the coupling through hole 31 provided in the engine cover 30. Is coupled, and when the engine cover 30 is covered, the eccentric shaft of the eccentric pin rotation screw 80 is placed in the eccentric shaft linear movement groove 59 provided on the projection lens assembly 50. Projecting the image on the screen. While operating the pico projector to find the optimal focusing position by rotating the eccentric pin rotating screw 80 using a screwdriver, apply UV adhesive to the eccentric pin rotating screw 80 as a whole and then UV curing to focus. Manufacturing of the completed pico projector is completed.

Although the preferred embodiment of the present invention has been described and illustrated using specific terms, such terms are only intended to clearly describe the present invention, and the embodiments and described terms of the present invention are the technical spirit and scope of the following claims. It is obvious that various changes and changes can be made without deviating from. Such modified embodiments should not be individually understood from the spirit and scope of the present invention, and should be said to be within the scope of the claims of the present invention.

10: cooling unit 20: engine base
30: engine cover 31: through hole
50: projection lens combination 51: first barrel
52: second berel 57: stop ring
59: Eccentric shaft linear movement groove 61: Extrusion guide
71: guide rail 80: eccentric pin rotating screw
81: driver groove 83: eccentric shaft

Claims (5)

A pico-sized projector having a projection lens assembly mounted between the engine base and the engine cover to move linearly within a certain range along the projection direction of light,
It is formed to be exposed on the upper engine cover, the pico size projector, characterized in that it comprises an eccentric pin rotating screw for adjusting the position on the straight line of the projection lens assembly.
According to claim 1,
An eccentric axis linear movement groove formed in a linear shape on the upper portion of the projection lens assembly in a direction perpendicular to the projection direction of light,
Combined through-hole provided at a corresponding position of the engine cover corresponding to the center of the eccentric shaft linear movement groove and
A pico-sized projector comprising the eccentric pin rotation screw provided in the coupling through-hole and provided with a driver groove at an upper portion and an eccentric shaft formed at an off-center position at the lower portion.
According to claim 2,
The projection lens assembly is composed of an integrally formed barrel, and the eccentric axis linear movement groove is a pico size projector, characterized in that provided in the upper portion of the barrel.
According to claim 3,
The left and right sides of the barrel are provided with protruding guides which are protruded at a predetermined length in directions perpendicular to the direction in which light is projected from the projection lens at positions symmetrical to each other,
The engine base is provided with a guide rail for supporting the projecting guide from the bottom, characterized in that the pico size projector.
In a method for adjusting the focusing of the projection lens assembly in a pico-sized projector having a projection lens assembly mounted between the engine base and the engine cover so as to move linearly within a certain range along the projection direction of light,
A first step of mounting the projection lens assembly between the engine base and the engine cover,
A second step of rotating the eccentric pin rotating screw provided to be exposed outside the engine cover;
A third step of adjusting the focusing by moving the projection lens assembly in the projection direction of light by using the rotational force of the eccentric pin rotating screw and
And a fourth step of fixing the eccentric pin rotating screw with an adhesive.

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