What does a photoplotter do? How does a photoplotter work?

1. Surface. It plays a role in preventing scratches and protecting the silver salt emulsion layer from being damaged.

2. Medicinal film (silver salt emulsion layer).

The main components of the emulsion are silver bromide, silver chloride, silver iodide and other silver salt photosensitive substances, as well as gelatin and pigments.

3. Adhesive layer.

Promotes the adhesion of the emulsion layer to the tablet base. That is, in order to improve the binding force between the emulsion and the tablet base, the aqueous solution of gelatin and chromium alum is used as the binding layer to make it firmly combined.

4. Polyester base layer.

Carrier flake base, negative flake base generally uses nitrocellulose, acetate or polyester flake base. The first two types of sheet bases are highly elastic, and the size of polyester sheet bases is more stable.

5. Anti-halo electrostatic layer.

Anti-halo and static electricity, In general, the underside of the photographic film substrate will reflect light, causing the emulsion layer to be photosensitive again and produce halos. To prevent haloing, an aqueous solution of gelatin and alkaline magenta is applied to the back of the sheet base to absorb light. This is called an anti-halo layer.

A photoplotter is an instrument that uses light to draw pictures. A photoplotter should be told: which tool to use; When to use this tool; Next, move the bald head to **; Walk in a straight line or in an arc. In the case of photoplotters, the word "tool" refers to a specific shape.

Holes, through which light passes to produce an image of a specified shape on the negative. If the bald head does not move, a pad (FLASFH) can be generated with **hole**; If you move the head, a straight line or arc is generated. There are two main types of photoplotters:

Vector (directional) and laser (also known as lattice type, grating type). The two types of photoplotters control the holes differently.

a) Check the user's files.

The files brought by the user should first be routinely checked:

1. Check whether the documents are in good condition;

2. Check whether the file is poisonous, and if it is poisonous, it must be killed first;

3. If it is a gerber file, check whether there is a D-code table or a D-code inside.

2) Check whether the PCB design is in line with the process level of our factory.

1. Check whether the various spacings of the PCB design in the customer's documents conform to the factory process: the spacing between the wires, the spacing between the wires and the pads, and the spacing between the pads and pads. The above spacing should be greater than the minimum spacing that can be achieved by the production process of our factory.

2. Check the width of the wire, and require that the width of the wire should be greater than the minimum line width that can be achieved by the production process of the factory.

3. Check the size of the through hole to ensure the minimum aperture of the production process of our factory.

4. Check the size of the pad and its internal hole diameter to ensure that the edge of the pad after drilling has a certain width.

3) Determine the process requirements, and determine various process parameters according to the user's requirements.

Process requirements: 1. Different requirements of the post-sequence process to determine whether the PCB photographic film (commonly known as film) is mirrored. Principles of Negative Mirroring:

The film surface (i.e., the adhesive surface) is applied to the film surface to reduce the error. The Determinant of Negative Mirroring: Craftsmanship.

If it is a screen printing process or a dry film process, the copper surface of the substrate on the surface of the negative film film shall prevail. If diazo tablets are used**, because the diazo tablets are copied as the mirror image, the mirror image should be the surface of the negative film film and not attached to the copper surface of the substrate. If the PCB is photopainted as a cell negative, rather than imposing on a PCB photographic negative, an additional mirror image is required.

2. Determine the parameters of solder mask expansion.

Determination principle: the wire next to the pad should not be exposed.

Small can not cover the pad.

Due to errors during operation, the solder mask diagram may deviate from the line. If the solder mask is too small, the result of the deviation may cause the pad edges to be obscured. Therefore, it is required that the solder mask should be larger. However, if the solder mask expands too much, the conductor next to it may be exposed due to the influence of deviation.

The graphic information sent by the computer is processed by RIP and then enters the driving circuit to control the operation of the semiconductor laser, which will send electrical signals.

It is transformed into an optical signal, which is focused on the film sucked by the roller through the objective lens, the cylinder rotates at high speed for the longitudinal main scan, the optical recording system moves horizontally for the secondary scanning, and the two scanning movements are synthesized to realize the graphic information processed by the calculation and filial piety computer to be restored on the film in the form of a dot matrix. The main scan is connected by the drum, the main motor, the encoder and the drum shaft. When the main motor drives the drum to rotate, the encoder reading system outputs the corresponding encoder signal.

After the control board and the frequency doubling phase lock, the dot pulse signal in the main scanning direction, that is, the circumferential direction of the cylinder, is generated. At the same time, this dot pulse signal controls the recording optical system on the optical table. The laser recording system will accurately hit the multi-beam dot on the corresponding physical position of the cylinder circumference through the laser modulation driving circuit through the laser modulation driving circuit, and the dot pulse signal generated by the grating will accurately hit the multi-beam dot on the corresponding physical position around the cylinder circumference.

When the drum rotates for one week, the synchronous stepper motor is driven by the grating dot pulse signal to drive the optical table on the screw rod to traverse the position of multiple light points in the direction of the main axis of the drum. In this way, the sub-scanning work is completed, and the main and secondary scanning are synchronously controlled by the dot pulse signal generated by the grating signal, so as to realize the multi-beam parallel spiral recording scanning of the photosensitive film adsorbed on the circumferential surface of the cylinder.

The laser photoplotter uses a laser to scan the film to produce a pattern, just like the electron gun in the picture tube of a television scans the fluorescent substance on the screen. First, the graphics of the printed circuit board are imaged into a large memory array, and then the laser beam is turned on or off (modulated) according to the values of the corresponding cells in the memory array, so as to obtain the required process film. The laser photoplotter uses laser as the light source, which has the advantages of easy focusing, energy concentration, etc., which is very beneficial to the instantaneous and fast negative, and the edge of the drawn negative is neat, contrasting, and not empty.

**Scanning, no matter how dense, can be completed in the shortest time**, and it only takes a few minutes to draw a negative. Therefore, Chenghua is the mainstream of today's light painting industry. The light source of the laser light painting machine mostly uses gas lasers, such as argon, helium and neon.

The light source of gas lasers has a large intensity but a limited lifespan, about 6000 10000h, so it needs to be replaced after more than a year of use. Some photoplotter manufacturers use semiconductor lasers as light sources, but the production of higher-power semiconductor lasers is not very mature.

As China's macro economy enters a new stage of medium-high speed growth, China's economy is undergoing a comprehensive and profound structural change. During the "13th Five-Year Plan" period, the economy will shift from an industry-led economy to a service-oriented economy, from a traditional industry-led economy to an innovation-led economy, and from an investment-led economy to a consumption-led economy, which will become the basic connotation and main characteristics of China's economic shift and transition period.

The report mainly analyzes the policy, economy, technology and environment of the laser photoplotter industry; The development status of the laser photoplotter industry; Competitive status of the laser photoplotter industry; The development status of marketing channels in the laser photoplotter industry; the operating conditions of key enterprises in the laser photoplotter industry; Analysis of entry barriers and investment in laser photoplotter industry; Comprehensively and accurately reflect the market trend and development trend of the entire laser photoplotter industry.

According to the development trajectory of the laser photoplotter industry and many years of practical experience, the report makes a prudent analysis and analysis of the future development trend of the laser photoplotter industry. Help customers accurately understand the latest development trends of the laser photoplotter industry, grasp market opportunities, make correct business decisions, and clarify the development direction of enterprises.

This report will help enterprises in the laser photoplotter industry to accurately understand the latest development trends of the laser photoplotter industry, find the blank spots, opportunities, growth points and profit points of the laser photoplotter industry market as soon as possible, grasp the unmet market demand and trends of the laser photoplotter industry, form a good sustainable development advantage of the enterprise, effectively avoid the investment risk of the laser photoplotter industry, effectively consolidate and expand the strategic market, and grasp the initiative of industry competition.

Laser photoplotter, known as photoplotter, is a phototypesetting product integrating laser optical technology, trace-Ming micro-Shoubi electronic technology and ultra-precision machinery, which is used to draw various graphics, images, words or symbols on photosensitive film film.