CN2271723Y

CN2271723Y - Writing Projector

Info

Publication number: CN2271723Y
Application number: CN 95238314
Authority: CN
Inventors: 黄喜平
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-12-24
Filing date: 1995-12-24
Publication date: 1997-12-31
Anticipated expiration: 2005-12-24

Abstract

The utility model discloses a writing projector used in electronic teaching. A halogen tungsten lamp can be used as a light source. The light ray causes the lamp light to converge into a line by a cylindrical reflector and a cylindrical convex lens. A concave lens is diffused to the whole surface by abnormity surface saw teeth. Thelight source rays disperse on the whole lamp to form a beam of light. The converged light rays can form a line, so that the angle of the concave lens shooting on the abnormity saw teeth becomes small. The light is soft and not dazzling. The brightness is correspondingly uniform, and the light brightness of the projection screen is correspondingly consistent. The clarity degree of the demonstration utensil of the projection on the screen can be regulated (namely focalize), so that the content of the projection on the screen is clear.

Description

The novel projector of writing

The utility model relates to a kind of in electronic teaching, is used to throw in various prefabricated black and white and color film and for writing immediately and to the projector of writing of various demonstrating appliances enlarging projections in kind.

The existing projector of writing, be to make light source with low voltage bulb, with concave mirror (reflector) its light reflected in parallel of bulb directive is gone back, planoconvex lens (condenser) is assembled its parallel rays of directive a bit, through Fresnel Lenses (Fresnel lens) convergent point light is diverged in whole surface, the parallel demonstrating appliance that passes penetrates, and planoconvex lens is assembled the parallel rays that penetrates a bit again, through flat mirror reflects to screen.Because light source is that electricity consumption is forced down in 36 volts, power is less than 500 watts bulbs such as bromine tungsten filament lamp, it can not directly connect 220 volts power for illumination, need through low frequency appendiron core transformer or high frequency magnetic core electronic transformer 220 volts, become the required voltage of bulb, and every group of output voltage of transformer immobilizes, and volume is big, Heavy Weight.Bulb be with a light to around irradiation, become parallel rays through reflection shielding film, the directive convex lens are converged to its parallel rays of directive a bit through convex lens.The point radiant, because of the light high concentration, light source environment temperature height is difficult for heat radiation, the light source ambient light is very strong, on projector, when writing immediately, high light stimulates very big to human eye, cause dim eyesight, battle array such as fatigue shape, convergent point light with the primary optical axis of Fresnel Lenses be the axle center to around inject Fresnel Lenses with certain angle, diverge in whole surface, parallel ejaculation, the intermediate portion light splitter is little because of emission angle, then ray density is big and bright, the edge that keeps to the side more, and the light emission angle is big more, then ray density is rare and dark, cause brightness irregularities, make projection screen light luminance all around darker than center section, the demonstrating appliance content of periscian is light darker than the middle part.Adjusting be projected on the screen demonstrating appliance know degree (promptly focusing) time can not take into account, or be that the center section project content is clear, fuzzy relatively all around; Be that periscian's content is clear, center section is fuzzy relatively.

The utility model is for overcoming above-mentioned deficiency, and the radiant bulb of changing the time is a linear light light source fluorescent tube, makes luminous and converging ray in alignment, and light is evenly distributed on the straight line.Make the angle of injecting plane special-shaped sawtooth concavees lens little, ray density relative evenly, when writing immediately, weakening high light stimulates eye, light is relative with the middle part light luminance consistent around making projection screen, be projected in content on the screen know degree relative can take into account adjusting, just the content of projection demonstrating appliance is clear.

The utility model is achieved in that

Form by fontanel tungsten lamp lamp tube light source, cylindricality reflective mirror, cylindrical convex lens, plane special-shaped sawtooth concavees lens, silicon-controlled voltage regulation device, horizontal measuring instrument, shading curtain etc.Luminous by fontanel tungsten lamp lamp tube light source, produce light, through cylindricality reflective mirror and cylindrical convex lens that convergence of rays is in alignment; Through plane special-shaped sawtooth concavees lens with the divergence of beam assembled in whole lens surface; By silicon-controlled voltage regulation device and shading curtain, the control light source produces the power of light and the area of projection window projected light amount; The adjustment pin, the eye-level measuring instrument, indication fontanel tungsten lamp pipe becomes horizontality.

It is 220 volts that light source is selected voltage for use, and power is less than 500 watts fontanel tungsten lamp fluorescent tube; Projector has four fixing feet, and two pin scalable high and low positions (being the adjustment pin) are wherein arranged, by the horizontality of horizontal measuring instrument indication adjusting fluorescent tube.By the silicon-controlled voltage regulation device, regulate the voltage swing of control input lamp tube ends, change the power of light that fluorescent tube produces on demand.Power according to using projection device ground size and light in projection device, is provided with two symmetrical shading curtains, regulates the position of shading curtain, i.e. the area of may command projection ray.Fluorescent tube is fixed on the cylindricality reflective mirror focal line, makes its light of fluorescent tube directive, to the parallel ejaculation of cylindrical convex lens.By cylindrical convex lens, with the parallel convergence of rays light in alignment that passes it; Through plane special-shaped sawtooth concavees lens, the straight line light that cylindrical convex lens is assembled diverges in the parallel ejaculation of whole lens surface.Plane special-shaped sawtooth concavees lens, it is principle according to Fresnel Lenses, a surface at two parallel plastic plates has difform straight line or curved sawtooth, and the face that two parallel plastic plates are had sawtooth is bonded together, and just constitutes plane special-shaped sawtooth concavees lens.

The utility model has the following advantage and effect: the radiant bulb of changing the time is a linear light light source fluorescent tube, making convergent point is to assemble straight line, increased light-emitting area, ray density is descended, light is soft, not dazzling, and lamp tube light source increases temperature dispersion because of light-emitting area, easily heat radiation, fluorescent tube can directly be connected on 220 volts of powers for illumination, thereby has saved transformer, has reduced machine volume and weight, be provided with silicon-controlled voltage regulation device regulating and controlling lamp tube ends input voltage, can regulate the light of fluorescent tube according to projection environment needs, the projection window is provided with the shading curtain, by the area of required projection demonstrating appliance, regulate control projection light quantity area.

Converging ray is a straight line, the light angle of injecting plane special-shaped sawtooth concavees lens is reduced accordingly, ray density is consistent relatively, diverge in whole plane special-shaped sawtooth lens surface, make the parallel light that passes corresponding evenly, the brightness unanimity, be projected in content on the screen know degree relative can take into account adjusting, make the content of projection demonstrating appliance clear.

Introduce the structure of utility model below in conjunction with accompanying drawing:

Fig. 1 is the novel external structure sketch of writing projector.

Fig. 2 is the novel inner structure sketch of writing projector.

Fig. 3 is the novel cylindricality reflective mirror front view of writing projector.

Fig. 4 is the novel cylindricality reflective mirror left view of writing projector.

Fig. 5 is the novel cylindrical convex lens front view of writing projector.

Fig. 6 is the novel cylindrical convex lens left view of writing projector.

Fig. 7 looks sketch for the novel plane special-shaped sawtooth concavees lens master who writes projector.

Fig. 8 looks sketch for a novel plane special-shaped sawtooth concavees lens left side of writing projector.

With reference to accompanying drawing: fluorescent tube 1, cylindricality reflective mirror 2, cylindrical convex lens 3, plane special-shaped sawtooth concavees lens 4, shading curtain 5, silicon-controlled voltage regulation device 6, horizontal measuring instrument 7, adjustment pin 8.

Unreceipted mark among the figure, its structure and existing to write projector same or similar.

Fluorescent tube 1 is fixed on the focal line of cylindricality reflective mirror 2, by cylindricality reflective mirror 2 with its light of fluorescent tube 1 directive to cylindrical convex lens 3 parallel ejaculations, behind cylindrical convex lens 3 with convergence of rays light in alignment, cross plane special-shaped sawtooth concavees lens 4, the straight line light of assembling is diverged in the parallel ejaculation of whole lens surface, regulate control projection device projection light quantity area by shading curtain 5, silicon-controlled voltage regulation device 6 is regulated lamp tube ends voltage, the power of control light, adjustment pin 8, eye-level measuring instrument 7, the horizontal level of indicating lamp tube.

Claims

The 1 novel projector of writing, form by fontanel tungsten lamp lamp tube light source, cylindricality reflective mirror, cylindrical convex lens, plane special-shaped sawtooth concavees lens, silicon-controlled voltage regulation device, horizontal measuring instrument, shading curtain etc., it is characterized in that: luminous by fontanel tungsten lamp lamp tube light source, produce light, through cylindricality reflective mirror and cylindrical convex lens that convergence of rays is in alignment; Through plane special-shaped sawtooth concavees lens the straight line light of assembling is diverged in a whole lens surface; By silicon-controlled voltage regulation device and shading curtain, the control light source produces the area of strong, the weak and projection window projected light amount of light; The adjustment pin, eye-level measuring instrument, the horizontality of indication fontanel tungsten lamp fluorescent tube.
The 2 novel projector of writing according to claim 1 is characterized in that: it is 220 volts that light source is selected voltage for use, and power is less than 500 watts fontanel tungsten lamp fluorescent tube.
The 3 novel projector of writing according to claim 1 is characterized in that: by the voltage of silicon-controlled voltage regulation device control input lamp tube ends, change the power of light that fluorescent tube produces.
The 4 novel projector of writing according to claim 1 is characterized in that: according to the needs that use projection size and light power, regulated the area that changes the projection light quantity by the shading curtain.
The 5 novel projector of writing according to claim 1 is characterized in that: by the cylindricality reflective mirror with its light of fluorescent tube directive to the parallel ejaculation of cylindrical convex lens.
The 6 novel projector of writing according to claim 1 is characterized in that: by cylindrical convex lens, with the parallel convergence of rays light in alignment that passes cylindrical convex lens.
The 7 novel projector of writing according to claim 1, it is characterized in that: according to the principle of Fresnel Lenses, a surface at two parallel plastic plates has difform straight line or curved sawtooth, the face that two parallel plastic plates is had sawtooth is bonded together, and just constitutes plane special-shaped sawtooth concavees lens.
The 8 novel projector of writing according to claim 1 is characterized in that: by plane special-shaped sawtooth concavees lens, the straight line light that cylindrical convex lens is assembled diverges in the parallel ejaculation of whole lens surface.
The 9 novel projector of writing according to claim 1 is characterized in that: by horizontal measuring instrument, the horizontality of fluorescent tube is regulated in indication.