Patent GB-1461470-A (GB)
Title: Sight
IPC: F41G1/32
Filed: 1974-12-17
Abstract: 1461470 Sight FORENADE FABRIKSVERKEN 17 Dec 1974 [20 Dec 1973] 54560/74 Heading F3C A sight has a telescope containing at least one row of luminescence diodes, which are so connected to electronic circuits that a travelling light point is obtained, the travelling speed of the light point is manually adjustable by a wheel so that the light point can follow a target and the sight has means for extinguishing the travelling light point and lighting a luminescence diode determining the superelevation when the distance to the target is set. In an embodiment the telescope has one row L of luminescence diodes, the sight has means which, when the distance to the target is set, light the luminescence diode corresponding to the aiming point. The sight comprises a device 102 containing the electronic circuits, a line screen 101, a wheel 103, the row L of diodes, a handle 104 and a button 105. When measuring the range or distance to a target the measuring lines of the line screen 101 are made to displace in relation to each other by the wheel 103 until they de-limit the measuring section. The row L of luminescence diodes, which is mirrored in the line screen 101, is simultaneously raised so that the correct superelevation is attained, the centre diode of row L now being the only one which is alight. When measuring the lead, the electronic device 102 is operated by the handle 104 so that only the centre diode is lighted when the handle 104 is in neutral position. Turning the latter to the left or to the right causes a train of light points which appears to move to the left or the right respectively. The lead is measured by causing the movement of the light points to coincide with the speed of the target. Pressing of the button 105 extinguishes the train of light points and determines which diode is to be lighted and to be the aiming point. The row of diodes L fills the whole or the greater part of the field of view of the sight. The device 102, Fig. 3, has a pulse generator PG, a decade counter DR, a 20-counter TR, gates G1, G2 and G3, monostable flip-flops MV1 and MV2, potentiometers P1, P2 and P3, transistors T1, T2, a switch O, contact means K and a number of diodes. When a battery is connected the pulse generator PG starts and steps forward the decade counter DR since the gate G1 is at a high level on the second input (1). The flip-flops MV1 and MV2 are at low level O. The 20-counter TR is zeroed, i.e. its outputs are high. The gate G3 supplies high level via the diodes D2 and D3 to the transistors T1 and T2. The row of luminescence diodes is thereby provided with driving voltage. The light strength can be adjusted by the potentiometer P1. When the pulses from the pulse generator reach the decade counter, output 1 will at first be at low level, thus lighting the diodes 1, 10, 19, 28 and 37. After a further pulse, output 2 will be at low level, thus lighting the diodes 2, 11, 20, 29 and 38. The pulse repetition frequency can be altered by turning the potentiometer P2, this altering the travel speed of the light points. The switch O determines the target travel direction and the light points are caused to move in this direction when the pulses and the target travel with the same relative speed, the distance is set. The range-finding wheel 103 is coupled to the potentiometer P3, which effects the pulse length of the flip-flop MV1. The pulse length increases with increased distance. If a laser range finder is used, this will give an output pulse which is proportional to the distance. When the range is measured, the contact means K is depressed, the flip-flops MV1 and MV2 are triggered and the gate G1 is set to block. The decode counter is zeroed, the luminescence diodes are extinguished, the gate G2 opens and pulses from the pulse generator are counted in the 20-counter. When the flip-flop MV1 returns to O, the gate G2 closes and the number of pulses which are counted in permit the corresponding output on the 20-counter to assume low level. A diode is thereby lit, either to the right or to the left of the centre line of the luminescence diode row, depending on the position of the switch O, the flip-flop MV2 and the gate G3 tripping out the voltage to the diodes D2 and D3, and the diode being lit as long as the flip-flop MV2 is at high level. Pulse time of the flip-flop corresponds to the time the measured speed and distance may be expected to apply. The flip-flop thereafter cuts out, zeroes the 20-counter, measures the voltage on both the left-hand side and right-hand side of the luminescence diode and opens the gate G1. The light points begin once again to travel with set angular speed.