CN2319833Y

CN2319833Y - Transmission-type teaching projector

Info

Publication number: CN2319833Y
Application number: CN 97239158
Authority: CN
Inventors: 张昌金; 陈道远
Original assignee: Huawen Science & Teach Co Ltd Changde City
Current assignee: Huawen Sci. & Educational Tech. Co., Ltd., Changde City
Priority date: 1997-11-06
Filing date: 1997-11-06
Publication date: 1999-05-19
Anticipated expiration: 2007-11-06

Abstract

The utility model relates to a transmission-type teaching projector, comprising a machine case (1) and a hinge-type machine lid (2). A cooling structure which adopts an axial-flow fan to cool a bulb and a table top is arranged. The utility model, a projector which utilizes stepless line contact friction for focus adjustment, has the advantages of gearless focus adjustment, high precision, easy operation and good performance, and the utility model is suited for teaching and scientific research.

Description

Transmission-type teaching projector

The utility model relates to particularly a kind of teaching projector of a kind of projector.

At present; the projector of selling on the market, using; because focusing adopts pure gear to regulate; exist not only its manufacturing process complexity but also damage easily; defectives such as focusing accuracy is not good enough; because being installed, the bulb holding circuit do not make the dash current when bulb is started shooting influence simultaneously; easily because of the overcurrent disintegration of filament; and blower ventilation all adopts drum-type, and air vent only pays attention to the cooling to bulb and transformer, therefore not only makes its volume big; the cost height; complex structure, and owing to ignored the cooling of table top screw thread mirror, and cause the table top temperature too high.

The purpose of this utility model is exactly stepless focusing of a kind of employing and the features simple structure that designs at above-mentioned deficiency, brightness and sharpness height, and the table top temperature is low and have a teaching projector of protective device.

The technical solution of the utility model is: between power transformer in the cabinet and the bulb electric current overvoltage protector is installed; a reflector is installed below the bulb; condenser is installed on it; a side is equipped with axial fan in the cabinet; the outside with radial type cover lid thereon; lifting structure adopts the stepless elevating mechanism of line contact; the lower-left end of stepless elevating mechanism support is fixed with the compressing tablet rest pad; compressing tablet is hinged on the compressing tablet rest pad; the line contact roller is by compressing tablet and the contact friction of principal post line, and spring pressure is between principal post and support.

The utility model has the advantages that: the simple and direct dexterity of 1. focusing, the life-span is long, and clear image is true to nature, and elevating mechanism adopts line contact roller to make stepless zooming, and precision is higher; 2. be provided with the bulb protector, bulb life is prolonged; 3. increase two stealthy air vent cooling screw thread mirrors in the upper end of cabinet, the table top temperature is reduced; 4. adopt quiet profile shaft streaming blower fan cooling, the efficient height; 5. the support employing is collapsible, is easy to store and transportation.

Accompanying drawing 1 is front view of the present utility model;

Accompanying drawing 2 is elevating mechanism structural representation of the present utility model;

Accompanying drawing 3 is electric structural drawing of the present utility model.

Below in conjunction with accompanying drawing an embodiment of the present utility model is set forth.

The left side of cabinet [1] bottom is equipped with a power transformer [3]; the output of power transformer [3] is connected to the bulb protector; bottom center at cabinet [1] is equipped with a reverberation bowl [6]; a bulb [7] is installed above the reverberation bowl [6]; condenser [8] is installed on the bulb [7]; on the right of cabinet [1] an axial fan is installed; a radial type cover [2] is installed on the cabinet [1]; two stealthy air vents have been increased in the cabinet upper end; cooling screw thread mirror; guard shield [4] passes through fixedly principal post [9] of set lever [5], and elevating mechanism is fixed on the principal post [19].

The lower-left end of the support [22] of elevating mechanism [16] is fixed with a compressing tablet rest pad [23], compressing tablet [26] is fixed on [23] on the compressing tablet rest pad, line contact roller [24] compresses by compressing tablet [26] and principal post [19] line contact friction, the left upper end fixed lens carriage [20] of support [22] is equipped with reflective mirror and lid [21] above the camera lens carriage [20]

The course of work of the utility model transmission-type projector is: should open reflective mirror lid [21] before using earlier to about 45 ° in water, the energized line, turn on the power switch [12], on worktable [14], put projection film, turn adjusting handle [17] makes its image transfer to optimum efficiency as required, if power supply is low excessively, brightness can transfer to dimmer switch [11] the high light shelves inadequately makes its image more clear.If bulb burns out, can operate and change lamp handle [10] at work, the cut-in stand-by bulb is proceeded teaching rapidly; Too high if temperature occurs cabinet [1] in engineering process, above predetermined value, its temperature protector [K ₅] with the automatic cutout bulb power; When if cabinet inside maintenance or observation wait other matters need open cover [2], bulb power will be by automatic switch [15] automatic cutout, in order to avoid artificial get an electric shock and dazzling etc.

Claims

1, a kind of transmission-type teaching projector; comprise cabinet [1]; the bulb of device in the cabinet, catoptron [21], camera lens [18] and on radial type cover compositions such as [2]; it is characterized in that: an axial flow blower [9] is installed in the cabinet; the cabinet upper end has stealthy air vent; the stepless camera lens focusing elevating mechanism of line contact [16] is installed on the principal post [19], and bulb is equipped with an overcurrent and presses protector.

2, a kind of transmission-type teaching projector according to claim 1, it is characterized in that: the lower-left end of the stepless focus adjusting mechanism of line contact [16] support [22] is fixed a compressing tablet rest pad [23], compressing tablet [26] is hinged on the compressing tablet rest pad, line contact roller [24] is pressed on the principal post by compressing tablet, and spring leaf [25] is pressed between principal post and the support.