What is a light pen?

Question 1: What is a light pen and what is its use? Light pen Light pen is a computer input device in the form of photosensitive whip, which is used together with CRT display of computer. It allows users to point to objects or paintings displayed on the screen and reach the touch screen in a similar way, but with higher position accuracy. The light pen can be used for all CRT-based displays, but it cannot be used for LCD screens, projectors or other display devices.

Question 2: Brief introduction of light pen. Light pen is an input device of electronic computer, which is used with display. Sensitive to light, shaped like a pen, multi-purpose cable connected to the host. You can draw pictures and do other operations on the screen. A photosensitive sensor inputs the information of characters or cursor position on the display screen into the computer through the light pen program in the computer. Light pen is an input device of computer, which is simple in structure, low in price, fast in response and simple in operation. It is often used in interactive computer graphics systems. In the graphic system, the light pen organically combines human intervention, display and computer to form a man-machine communication system. Using the light pen, you can directly select or modify the displayed graphics on the display screen. The external image of the light pen is a ballpoint pen, which consists of the pen body, lens group, optical fiber, switch and wire (Figure 1). When working, the light pen receives the light on the display screen, converts it into an electrical signal, generates a pulse signal after amplification and shaping, inputs it into the computer, and sends an interrupt request to the computer. The graphic file stored in the display buffer memory represents a graphic entity. This file is read out by the display controller in time sequence and translated into characters, vectors, etc. And then displayed on the screen by a character generator, a vector generator and the like. At this time, if the light pen stays at a certain position in the graph, the light pen sends an interrupt request because it detects light, and the light pen program immediately freezes the display. The "frozen" data state of the display provides the computer with information such as the address of the buffer memory, the coordinate position of the main deflection counter and the mode word of the controller. This information is the basis for computers to process graphics according to people's wishes (Figure 2). The light pen works in two ways: point selection and tracking. ① Point selection: also called calibration, it is the process of selecting an element in the display object as a reference point with a light pen and processing the display object. ② Tracking: also known as positioning, it is the process of displaying a cursor on the display screen (there can be no graphics on the screen) and dragging the cursor with a light pen to implement positioning. The cursor can be generated by a hardware method or a software method.

Question 3: Introduction to the light pen The light pen is an input device of the computer, which has simple structure, low price, fast response speed and simple operation, and is often used in interactive computer graphics systems.

Question 4: What is the light pen of the camera? Light pen? I guess you mean the "pen" used by "light painting photography" to draw light traces?

If that's what you mean. The simplest one is "pointing light", which can be found on Taobao and is very cheap.

If the effect is better, you can also choose DIY, buy a battery box with switch wire+color LED+ battery, weld it with an electric soldering iron or stick it with insulating tape. There are also many light-emitting diodes and battery boxes on Taobao, which are very cheap and can be combined by themselves;

A strong light and a small flashlight can be used, but the light is too bright and directional, so it needs to be wrapped in a thick translucent material in front, which is difficult to master.

Question 5: What is the "light pen" in the computer? Is it an input device? Is the cursor, the mouse arrow.

Question 6: What is a laser pointer? Green light indicator:

Also known as star pen, laser pen, laser pen, green pen and hand-held laser. It is named because it has a very intuitive and strong visible light beam, which is often used for indication. Because of its bright beam and strong anti-stray light interference ability, it is increasingly used for teaching/astronomical pointing, fixed-point guidance and other functions. It is the first choice for laser enthusiasts/astronomy enthusiasts and outdoor enthusiasts. It can also be used as a high-grade gift for relatives and friends.

Product use:

Teacher/lecturer-used in classroom teaching, it is like an infinitely extended pointer, which allows you to easily point to the blackboard in any corner of the classroom. It is definitely a right-hand man for teachers!

Business person/conference speaker-used for product demonstration and conference explanation, so that your speech becomes arbitrary and the communication with customers is more relaxed and natural.

Exhibition Hall/Tour Guide-When you are at a loss in the face of an "unreachable" goal, it can help you point out the goal easily and accurately.

Outdoor traveler/explorer-used for outdoor exploration, indicating distant targets and sending distress signals to make your trip happier and safer.

Astronomical enthusiasts-used to refer to stars in astronomy, the green laser beam is a very beautiful green line, which is very suitable for observing the stars at night and can help you point out the positions of the stars.

Construction site/mining field-used to accurately indicate buildings from a distance, which can avoid approaching dangerous areas and make you feel like a battlefield commander thousands of meters away.

Self-defense-you can use it to defend yourself when you are attacked by dangerous animals in the mountains, or when gangsters rob you and threaten your life and property. You just need to take it out to scare each other, and don't really let others lose sleep. Military command or exercise-when you want to explain to your subordinates which direction your target is in the air or halfway up the mountain, do you still make desperate gestures with your hands? Of course, you don't have to. You can point to the horizon with one key, which greatly increases your manners. Fire fighting/disaster relief/distress/earthquake-life-saving pens in various emergencies.

Play-Many people like the brightness of laser, and like high-power laser to play by lighting matches, cigarettes and other substances. Simply put, they are laser lovers. Lasers with different colors and powers have different properties, brightness or sorting ability.

Precautions:

Laser is harmful to human eyes. Please don't look directly into people's eyes. Please keep away from children to avoid accidents.

Question 7: How much is the optical fiber polishing pen? What is the detection line?

Light pen is an input device of electronic computer, which is used in combination with display. Sensitive to light, shaped like a pen, multi-purpose cable connected to the host. You can draw pictures and do other operations on the screen. A photosensitive sensor inputs the information of characters or cursor position on the display screen into the computer through the light pen program in the computer. Light pen is an input device of computer, which is simple in structure, low in price, fast in response and simple in operation. It is often used in interactive computer graphics systems. In the graphic system, the light pen organically combines human intervention, display and computer to form a man-machine communication system. Using the light pen, you can directly select or modify the graphics displayed on the display screen. It's better to use standard optical fiber and cable. We use Finit. .

Question 8: What is a white pen? White highlighter bar.

Problem, elona, nothing happened with the starlight pen. According to the latest version

1, the level reaches half of his (nothing will happen if the prompt is not met).

2. The magic ink of the opponent's level is about 10, and the magic ink can be collected in the dungeon (the prompt is not satisfied).

3. A friend whose relationship with the other party reaches the soul (dissatisfied with the other party's rejection of your prompt)

4. (This article is uncertain) There is an ap value of opponent level ×2. This article seems to have been cancelled in the new version 1.4 1.

Question10: What is the use of the pen wheel in PS brush? This function needs to be operated with a pressure-sensitive pen. After using the pressure-sensitive pen, the light and heavy effects of strokes can be simulated.