DE3600614A1 - Slide projector - Google Patents

Abstract

The invention relates to a slide projector having a slide magazine which can be inserted into the magazine guide and can be displaced automatically and/or manually, and a device for introducing the individual slides into the beam path of the projector. In order to enable the magazine compartments to be counted even when using different magazine systems, the invention is characterised by a device (1) for inputting the magazine sizes (number of the magazine compartments) into a microcomputer (2) connected to the projector and for displaying this value as well as the magazine system, devices (3) for detecting the start of the magazine or end of the magazine and for reproducing the signals to the microcomputer as well as to the device (4) of a scannable coder disc, driven by the slide magazine, for generating counting pulses in accordance with the forward or backward movement of the magazine. These counting pulses can likewise be conducted to the microcomputer for evaluation. <IMAGE>

Description

The invention relates to a slide projector with an in the magazine guide can be used automatically and / or manually slidable slide magazine and a device for inserting the individual slides into the beam path of the Projector.

The object of the invention is based on this slide projector to train so that even when used different magazine systems a count of Magazine compartments is possible.

According to the invention, this object is achieved by a Device for entering the magazine size (number of Magazine compartments) into one connected to the projector Microcomputer.

The magazine size and the magazine system are displayed. The beginning and end of the magazine are detected by light barriers detected. The counts are from one through the Magazine-driven coding disk scanned.

The slide projector according to the invention is so trained that the counts both at automatic as well as manual shifting of the Slide magazine can be generated.

This is achieved through the aforementioned coding disk driven by the slide magazine. This coding disc can, for example, of two retro-reflective sensors be scanned. As a facility for Detection of the beginning or end of the magazine can be done with infrared light barriers be used.  

The advantage of magazine size preselection (e.g. using Rotary switch) is that the magazine compartment counter both when loading the projector from the front as also works perfectly from behind. The means of Rotary switch set magazine size and type can are indicated by known LEDs.

The invention is based on a schematic block diagram are explained. In this circuit diagram are the main inputs and Output functions shown.

The circuit essentially consists of a 4-bit single-chip microcomputer ( 2 ).

A 3-digit seven-segment display ( 6 ) serves as the output unit, optionally for a timer or magazine compartment.

A keyboard ( 10 ) with 5 buttons serves as an input element:
1. Slide / Timer - switching between magazine compartment and timer display
2. Set - set the timer
3. Start / Stop - start and stop of the timer
4. Reset - Reset timer and magazine compartment
5. ⊲⊳ - Slide transport forward and backward

As further input elements, 2 infrared light barriers follow, which are arranged to the right and left of the slide. The beginning and end of the magazine are queried via these two light barriers; the light barriers are linked "or". The information about the magazine end is important in connection with the setting of the rotary switch 1 for the magazine size. When loading the projector from the front, the light barrier 3 for the magazine end is interrupted first. 000 appears in the display. When the last slide is inserted, the magazine size appears in the display.

The µP saves the set magazine size and decrements the magazine compartment counter at the next one Reverse transport pulse. By programming the Magazine size is always guaranteed depending on Correct magazine compartment is displayed. The Programming of the magazine size also remains Receive shutdown of the projector.

The magazine compartment counter counts up or down depending on the transport direction. the pulse generation for the counting direction and the counting pulse takes place by means of a coding disk 4 , which is scanned by reflection light barriers 5 . This conversion of a rotary movement into electrical impulses prevents the magazine compartment counter from counting briefly in succession when the trigger button is pressed. Another advantage of this pulse generation is the up and down counting when pushing the magazine by hand, which is not possible if the counter is only controlled by the transport pulses of the magnet.

• Designations: 1 rotary switch for magazine size
  2 microcomputers
  3 light barriers (magazine start / end)
  4 coding disk
  5 retro-reflective sensors
  6 display
  7 display (magazine count or timer)
  8 slide alternating pulse
  9 Magazine system display
  10 keyboard

Claims (5)

1.Dia projector with an automatically and / or manually displaceable slide magazine that can be inserted into the magazine guide and a device for inserting the individual slides into the beam path of the projector, characterized by a device ( 1 ) for entering the magazine size (number of magazine compartments) in one with the Projector-connected microcomputers ( 2 ) and for displaying this value and the magazine system, devices ( 3 ) for detecting the beginning or end of the magazine and for forwarding the signals to the microcomputer, as well as the device ( 4 ) for a scanable coding disk driven by the slide magazine for generating Counting pulses corresponding to the forward or backward movement of the magazine, these counting pulses also being able to be sent to the microcomputer for evaluation. 2. slide projector according to claim 1, characterized, that the counts in both automatic and manual shift of the slide magazine can be generated.   3. Slide projector according to claim 1, characterized in that the coding disk ( 4 ) of two reflection light barriers ( 5 ) can be scanned. 4. slide projector according to claim 1, characterized in that infrared means are provided as a device ( 3 ) for detecting the beginning or end of the magazine. 5. Slide projector according to claim 1, characterized in that the device ( 1 ) for entering the magazine size consists of a rotary switch.